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Clara Murgui Galvez (CERN), Joachim Kopp (CERN), Maria Pestana Da Luz Pereira Ramos, Miguel Escudero Abenza (CERN), Valerie Domcke (CERN)01/09/2025, 09:30Talk
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Patrick Foldenauer (Instituto de Física Teórica UAM/CSIC Madrid)01/09/2025, 09:45Invited Talk
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Damiano Francesco Giuseppe Fiorillo (Niels Bohr Institute, University of Copenhagen)01/09/2025, 10:15Invited Talk
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Dwaipayan Mukherjee (Tata Institute of Fundamental Research)01/09/2025, 11:30Talk
A dense neutrino gas can exhibit collective flavor oscillations, driven by neutrino–neutrino forward scattering, which profoundly affect flavor evolution in core-collapse supernovae and the early Universe. While numerous studies have shown that a zero crossing in the difference of flavor distributions ($g_{\Gamma}$) of neutrinos determines the existence and character of instabilities, a...
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Pietro Ghedini01/09/2025, 11:35Talk
We investigate the clustering of neutrinos on both galactic and extragalactic scales, with the aim of probing their standard and non-standard properties. We focus on potential signatures of neutrino–dark matter interactions, which could imprint detectable features on the local distribution of cosmological neutrinos. Our phenomenological approach aims to produce testable predictions for future...
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Nicolas Grimbaum Yamamoto (Université Libre de Bruxelles)01/09/2025, 11:40Talk
Among the few methods to probe the early Universe through the observation of primordial particles, one possibility remains relatively unexplored: the detection of high-energy neutrinos emitted shortly after the Big Bang, originating from the decay or annihilation of early-Universe relics.
We present a general study of this scenario. First, we emphasise that such neutrinos could exhibit...
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Dibya S. Chattopadhyay (Oklahoma State University)01/09/2025, 11:45Talk
The KM3NeT collaboration recently reported the observation of KM3-230213A, a neutrino event with an energy of 220 PeV, $\mathcal{O}(10)$ times more energetic than the highest-energy neutrino in IceCube’s catalog. Despite its larger effective area and longer data-taking period, IceCube has not observed similar events, leading to a tension quantified between ~2$\sigma$ and 3.5$\sigma$, depending...
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Giuliano Giacalone01/09/2025, 11:50Talk
Reducing uncertainties in theoretical evaluations of the nuclear matrix elements (NME) is crucial for designing and interpreting experiments aimed at discovering neutrinoless double beta decay. In this work, we identify a new class of observables, distinct from those employed in low-energy nuclear structure applications, that are strongly correlated with the values of the NME: momentum...
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Matteo Parriciatu (Università degli Studi Roma Tre)01/09/2025, 11:55Talk
In the presence of a finite modular flavour symmetry, fermion mass hierarchies may be generated by a slight deviation of the modulus from a symmetric point. This small parameter governing charged-lepton mass hierarchies may also be responsible for the breaking of lepton number in a symmetry-protected low-scale seesaw. In this talk, I will illustrate the implementation and the phenomenological...
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Georg Raffelt (MPI Physik, Munich)01/09/2025, 14:00Invited Talk
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Jason Holt01/09/2025, 15:45Invited Talk
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Javier Menendez (University of Barcelona)01/09/2025, 16:15Invited Talk
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Julien Froustey (University of California, Berkeley (USA))01/09/2025, 16:45Invited Talk
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Stefan Sandner02/09/2025, 09:30Invited Talk
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Alberto Roper Pol (Universite de Geneve (CH))02/09/2025, 10:00Invited Talk
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Sara Bianco (DESY-T Hamburg)02/09/2025, 10:30Talk
Decays of relic particles into neutrinos can leave a strong imprint on the light elements formed during Big Bang Nucleosynthesis (BBN) if the decay happens before recombination. In this talk, I will discuss the effect of injecting neutrinos at lifetimes larger than 10⁴ s, focusing on the disintegration of the light elements. Several key processes are at play, including final-state radiation...
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Martina Cataldi (University of Hamburg)02/09/2025, 10:35Talk
The matter-antimatter asymmetry of the Universe represents one of the main open questions in particle physics and cosmology. In this talk, we will present a novel realization of cold baryogenesis, a mechanism involving the formation and decay of Standard Model SU(2)-textures, that relies on the out-of-equilibrium dynamics during a strong first order electroweak phase transition. By performing...
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Martha Ulloa Calzonzin (University of Florida)02/09/2025, 10:40Talk
We introduce a new mechanism where we claim that the Charge-Parity (CP) violation from mechanisms within the Standard Model (SM) is enough to generate the observed baryon asymmetry of the universe—an achievement that no other currently proposed mechanism can match. We use a Mesogenesis framework where the CP violation comes entirely from Standard Model contributions to neutral meson systems....
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Andrea Mitridate02/09/2025, 11:30Invited Talk
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Maximilian Volker Berbig02/09/2025, 12:00Talk
Motivated by the hint for time-dependent dynamical dark energy from an analysis of the DESI Baryon Accoustic Oscillation (BAO) data together with information from the Cosmic Microwave Background (CMB) and Supernovae (SN), we relax the assumption of a vanishing initial velocity for a quintessence field. In particular we focus on pseudo-Nambu-Goldstone-Boson (PNGB) quintessence in the form of an...
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Takuya Okawa02/09/2025, 12:05Talk
The Standard Model of particle physics does not explain the origin of the universe’s baryon asymmetry or its primordial fluctuations. The Affleck-Dine mechanism is a well motivated scenario for generating the baryon asymmetry through the post-inflationary dynamics of a complex scalar field with baryon number. The curvaton mechanism is a popular approach for producing curvature perturbations...
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Giona Sala (RWTH Aachen University)02/09/2025, 12:10Talk
The observation of gravitational waves (GW) from dark sirens provides a novel measurement, complementary to other surveys that are electromagnetic (EM) signal–based. Under the assumption that both observations trace the distribution of matter up to some bias parameters, it is possible to infer cosmological parameters by cross-correlating their density maps.
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As the number of resolved GW... -
Xucheng Gan (DESY)02/09/2025, 12:15Talk
The cosmic microwave background (CMB) spectrum is an extraordinary tool for exploring physics beyond the Standard Model. The exquisite precision of its measurement makes it particularly sensitive to small effects caused by hidden sector interactions. In particular, CMB spectral distortions can unveil the existence of dark photons which are kinetically coupled to the standard photon. In this...
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Duarte Da Silva Feiteira02/09/2025, 12:20Talk
Gravitational particle production provides an ever-present background in non-thermal dark matter studies. I discuss the correspondence between the Starobinsky and Bogolyubov approaches to the problem of inflationary particle production, and derive strong constraints on frameworks with scalar dark relics.
(Based on D. Feiteira, O. Lebedev, arXiv:2503.14652)
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Mario Fernandez Navarro (University of Glasgow)02/09/2025, 12:25Talk
In this talk I discuss the constraints imposed by BBN and CMB observations on primordial lepton flavour asymmetries with (approximately) vanishing total lepton number. I show that solving the momentum averaged quantum kinetic equations describing neutrino oscillations and interactions is an accurate approximation to the full momentum-dependent system, and the results reveal a rich flavour...
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George Alestas (CSIC/UAM)02/09/2025, 14:00Invited Talk
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Julien Lesgourgues (RWTH Aachen university)02/09/2025, 14:30Invited Talk
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Enrico Perboni (DESY)02/09/2025, 15:45Talk
Cosmological phase transitionscan give rise to intriguing phenomena, such as baryogenesis or a stochastic gravitational wave background, due to nucleation and percolation of vacuum bubbles in the primordial plasma. A key parameter for predicting these relics is the bubble wall velocity, whose computation relies onsolving the Boltzmann equations of the various speciesalong the bubble profile....
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Fabio Bernardo02/09/2025, 15:50Talk
Phase transitions are violent and interesting phenomena that could have occurred in the early stages of the universe. Possible perturbative techniques to study these phenomena and predict their gravitational wave background can be used in the presence of a hierarchy of scales, leading to the construction of Effective Field Theories at finite temperature by integrating out the heavier scales....
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Katarina Bleau02/09/2025, 15:55Talk
During a neutron star's formation in a supernova, its core may undergo a phase transition into deconfined quark matter. The phase transition would likely be first-order, proceeding by bubble nucleation. We show that such a phase transition would be accompanied by the emission of high-frequency gravitational waves (MHz band), which could be within reach of proposed gravitational wave detectors....
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Lina Necib (MIT)02/09/2025, 16:00Invited Talk
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Marco Gorghetto (DESY)02/09/2025, 16:30Invited Talk
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Ferruccio Feruglio03/09/2025, 09:30Invited Talk
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Nicole Righi (DESY)03/09/2025, 10:00Invited Talk
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Dr Seokhoon Yun03/09/2025, 10:30Talk
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Adriana Menkara03/09/2025, 10:35Talk
In scenarios where the Higgs is viewed as a pseudo Nambu-Goldstone boson (pNGB) the question of naturalness finds itself at a tipping point between direct searches and precision. If, by the end of the High-Luminosity LHC operation, all experimental results were to remain consistent with the Standard Model, precision Higgs coupling measurements will begin to drive the naturalness tension. To...
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Mr Mohammad Aghaie (University of Pisa)03/09/2025, 10:40Talk
Axions and axion-like particles (ALPs) remain compelling dark matter (DM) candidates, provided that the associated Peccei-Quinn (PQ) symmetry breaking scale $f_a$ is sufficiently large to ensure cosmological stability. In this talk, I will explore a novel framework in which ALPs possess flavor-violating (FV) couplings to Standard Model (SM) quarks, allowing them to be produced via freeze-in in...
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Pablo Quílez (Universidy of California San Diego (UCSD))03/09/2025, 11:30Invited Talk
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Philip Sorensen (U. Padua / INFN Padua)03/09/2025, 12:00Talk
Multiple axions may emerge in the low-energy effective theory of Nature. Generically, the potentials describing these axion fields are non-diagonal, such that a QCD axion might mix with one or more other axion-like-particles. QCD instanton effects render mixing between such states temperature-dependent. We explore how this mass-mixing can impact dark matter production through the misalignment...
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Riccardo Natale (DESY)03/09/2025, 12:05Talk
In this work, we study the cosmological implications of an initial displacement of the Peccei-Quinn breaking field generated during inflation and the subsequent oscillations of the field around its minimum. These oscillations induce a parametric resonance effect, leading to the exponential growth of perturbations. In our analysis, we employ lattice simulations to investigate the abundance of...
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Mariia Khelashvili (SISSA)03/09/2025, 12:10Talk
Electromagnetic fields of pulsars can source coherent axion signals at their rotational frequencies, which can be detected by laboratory experiments—pulsarscopes. As a promising case study, we model axion emission from the well-studied Crab pulsar, which would yield a signal at $f \approx 29.6$ Hz and be present regardless of whether the axion contributes to the dark matter abundance. We...
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Killian Bouzoud (SUBATECH)03/09/2025, 12:15Talk
The axion is a hypothetical particle first proposed by Peccei, Quinn, Weinberg and Wilczek to solve the strong CP problem. It was later realized that ultra-relativistic (or "hot") axions thermally produced in the early Universe can contribute measurably to the energy density of the Universe as dark radiation.
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The effective number of neutrinos Neff, parametrizing this dark radiation fraction... -
Tenta Tsuji (KEK Theory Center)03/09/2025, 12:20Talk
In modern cosmology, it is generally assumed that after inflation, the energy of the inflaton field is transferred to radiation through a process known as reheating.
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axion-like particle (ALP) have recently gained attention as potential inflaton candidates, as they naturally preserve the flatness of the inflaton potential due to their shift symmetry.
In our work, we explore the reheating... -
Yeray Garcia Del Castillo03/09/2025, 12:25Talk
Axions and Axion-Like-Particles (ALPs) are theoretically well-motivated candidates for dark matter that, due to their large occupation number, can be described as oscillating classical fields. These particles may feature a quadratic interaction with ordinary matter which can modify the field's dynamics in the vicinity of such objects, inducing a very interesting phenomenology. In this talk, I...
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Marzia Bordone (University of Zürich and CERN)03/09/2025, 14:00Invited Talk
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Maksym Ovchynnikov (CERN)04/09/2025, 09:30Invited Talk
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Ilaria Brivio (University & INFN Bologna)04/09/2025, 10:00Invited Talk
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Andrea Sainaghi (University of Padua)04/09/2025, 10:30Talk
Flavor deconstruction refers to a framework where the three fermion families are charged under non-universal gauge groups. Such Standard Model extensions have been proven to be capable of explaining flavor hierarchies among charged fermions. Recently, it has been shown that also neutrino anarchy can be realized within flavor-deconstructed models exploiting a seesaw mechanism. The present work...
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Nico Stirling (University of Helsinki)04/09/2025, 10:35Talk
A novel approach to neutrino oscillations is presented, which is analogous to birefringence. Neutrinos propagate as massless waves undergoing coherent forward flavour changing scattering off the quantum vacuum. The resulting coherent wave obeys a flavour mixing wave equation leading to; the standard oscillation probabilities, a universal effective refractive mass and a unique group velocity...
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Swagata Biswas (National Institute of Technology Durgapur)04/09/2025, 10:40Talk
The study on lepton flavour violating (LFV) decays in the framework of the non-universal $Z'$ model delves into several fascinating aspects of particle physics. Focusing on the $\Sigma_b$ decays, which are induced by the quark-level transition $b \rightarrow s l_1l_2$, is especially relevant given the existing experimental constraints on LFV processes. The lepton flavour violating decays are...
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Cari Cesarotti04/09/2025, 11:30Invited Talk
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Simone Meoni (INFN, University of Bologna (IT))04/09/2025, 12:00Talk
Axion-like particles (ALPs) are hypothetical pseudoscalar states that emerge as pseudo-Nambu-Goldstone bosons from the breaking of an approximate global $ U(1) $ symmetry. They appear in several extensions of the Standard Model, offering potential solutions to the strong CP problem, the muon $ g-2 $ anomaly, neutrino mass generation, and dark matter. While most collider-based studies focus on...
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Marko Pesut (University of Zürich)04/09/2025, 12:05Talk
We illustrate the potential of a future high-intensity $e^+e^-$ collider running at the $Z$ pole in probing extensions of the Standard Model via precise measurements of flavor-changing processes. We illustrate this potential both within effective field theories and simplified models inspired by current $B$-physics data, focusing on selected flavor-physics measurement projections at FCC-ee, and...
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Xiafei Chang04/09/2025, 12:10Talk
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. A new measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay by the NA62 experiment at the...
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Jorge Alda (Università di Padova/INFN)04/09/2025, 12:15Talk
In recent times there has been a growing interest in the search for Axion-Like Particles (ALPs), as well as dedicated data analyses to identify potential evidence of New Physics compatible with an ALP, resulting in constraints on the ALP parameter space. Therefore, it is now the time to present a tool, ALPaca, that facilitates the combination among the different information on ALP...
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José Filipe Bastos (CFTP, Instituto Superior Técnico, Universidade de Lisboa)04/09/2025, 12:20Talk
Even though a fourth chiral generation of fermions is experimentally ruled out, the possibility of extending the SM with vector-like quarks (VLQs), where both chiral components transform the same way under SU(2)_L cannot be excluded. In particular, extensions of the SM involving isodoublet vector-like quarks with standard charges currently stand as the favoured candidate in explaining the...
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Enrico Scantamburlo04/09/2025, 12:25Talk
Establishing the physics potential of future colliders is one of the main objectives of the HEP community in the coming years. The aim is on the one hand to consolidate the physics expectations from a circular collider working between the Z-pole and the ttbar threshold (FCC-ee at CERN) and exploring completely new avenues and technologies such as a multi-TeV e+e- or even mu+mu- collider. In...
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Francesca Calore (Unite Reseaux du CNRS (FR))04/09/2025, 14:00Invited Talk
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Tomer Volansky (Tel Aviv University (IL))04/09/2025, 14:30Invited Talk
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Itay Bloch (Tel Aviv University)04/09/2025, 15:00Invited Talk
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Adam Riess04/09/2025, 16:30Invited Talk
The Hubble tension—the persistent discrepancy between local and early-Universe measurements of the Hubble constant—remains one of the most intriguing puzzles in cosmology. The James Webb Space Telescope (JWST) now offers a fresh perspective on this issue by allowing an independent look at the same type of stars, Cepheids, used in the Hubble Space Telescope (HST) measurements that help define...
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Sandra Robles (Fermilab)05/09/2025, 09:30Invited Talk
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Chris Dessert (Flatiron Institute/New York University)05/09/2025, 10:00Invited Talk
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Nicolas Esser05/09/2025, 10:30Talk
Primordial black holes (PBHs) have been excluded from constituting the entirety of the dark matter (DM), except in the so-called 'asteroid-mass' range (between 10¹⁷ and 10²³ g) where they remain unconstrained. We present here observation-based constraints on PBHs in this previously open window, using photometric observations of local ultra-faint dwarf galaxies (UFDs) from the Hubble Space...
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Théo Paré (LUPM)05/09/2025, 10:35Talk
We explore the gravitational heating of exoplanetary systems by dark matter substructures of different kinds (primordial black holes -- PBHs, ultra-compact -- UCMHs, or classical subhalos). In this context, the scales of the dark objects probed are of the same order as the orbital radii of planets of interest. Distant exoplanets are quite sensitive to heating processes because less bound to...
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Yilda Boukhtouchen (Queen’s University)05/09/2025, 10:40Talk
Composite dark matter models, where dark matter exists in bound states formed in the early universe, have long been a source of scientific interest. In this talk, I will focus on loosely bound dark matter composite states, where the binding energy per constituent is small compared to the constituent’s bare mass. If this binding energy is sufficiently small, scattering with Standard Model...
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Josef Pradler (University of Vienna & Austrian Academy of Sciences (AT))05/09/2025, 11:30Invited Talk
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Leonie Einfalt05/09/2025, 12:00Talk
SABRE is an international collaboration that will operate similar particle detectors
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in the Northern (SABRE North) and Southern Hemispheres (SABRE
South). This innovative approach aims to distinguish potential dark matter
signals from seasonal backgrounds: a pioneering strategy only feasible with a
Southern Hemisphere experiment. SABRE South is located at the Stawell Underground
Physics... -
Aula Al-Adulrazzaq05/09/2025, 12:05Talk
Despite decades of global effort, DM particles have so far evaded all attempts of direct detection. This may suggest that DM particles are too light to be detected with current experiments. The experimental sensitivity towards low dark matter mass can be improved by electronic excitation induced by nuclear recoil, a process known as the Migdal effect. We are developing a general formalism to...
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Sri Sankari Alias Sowmiya Balan (Karlsruhe Institute of Technology)05/09/2025, 12:10Talk
Models of Sub-GeV dark matter coupled to a dark photon with kinetic mixing feature a rich phenomenology. They are thus constrained by a number of laboratory, astrophysical and cosmological observations. The biggest obstacle for fermionic DM particles to make up all of the observed DM comes from the strong constraints placed by the CMB and X-ray emission on DM annihilation. This can be overcome...
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Jordan Koechler (INFN Turin)05/09/2025, 12:15Talk
In this talk, we present a tuning of PYTHIA and a coalescence model that leads to realistic predictions of antinuclei production. This tuning is validated against LEP data including the fragmentation function of $b$-quarks into into $b$-hadrons, which is crucial for determining the $\bar{\Lambda}_b^0$ multiplicity. The coalescence model is tuned to ALICE data for the $\overline{\text{D}}$ and...
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Damon Cleaver (King's College London)05/09/2025, 12:20Talk
Ultra-heavy dark matter is a class of candidates for which direct detection experiments are ineffective due to the suppressed dark matter flux. We explore the potential of large underwater acoustic arrays, developed for ultra-high energy neutrino detection, to detect ultra-heavy dark matter. As ultra-heavy dark matter traverses seawater, it deposits energy through nuclear scattering,...
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Dr Seyed Peyman Zakeri (Institute for Research in Fundamental Sciences - IPM)Poster
In this work, we propose a novel indirect detection signature of dark matter (DM) associated with the exceptionally bright gamma-ray burst GRB 221009A. Within our scenario, singlet scalar DM particles, produced at the redshift of the GRB, are up-scattered by high-energy cosmic rays (HECRs) during their journey to Earth. These highly boosted DM particles subsequently decay dominantly into...
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David Winn (Fairfield University)Poster
We discuss a Dual to ordinary matter that yields composite self-interacting dark matter. For each elementary particle inn the SM, the Dual:
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1. Changes spin by ½, i.e. a SUSY-lite;
2. U(1): Changes electric charge e to magnetic charge g with g=e/; to avoid non-integer magnetic charge the up and down squark sectors have g=+3g and -6g, the charged sleptons and Wino are charged 2g;
3.... -
Erdenebulgan LkhagvadorjPoster
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Rahul Bhagat (BITS-Pilani Hyderabad Campus, Hyderabad, Telangana)
We have presented a cosmological model of the Universe in $f(Q)$ gravity which shows the accelerating behavior. First the modified Friedmann equations have been reformulated into a system of coupled differential equations in order to ensure that the minimal set of equations required for a second-order gravity theory. These equations are then solved numerically. To constrain the parameters...
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Mariia Khelashvili (SISSA)Poster
Electromagnetic fields of pulsars can source coherent axion signals at their rotational frequencies, which can be detected by laboratory experiments—pulsarscopes. As a promising case study, we model axion emission from the well-studied Crab pulsar, which would yield a signal at $f \approx 29.6$ Hz and be present regardless of whether the axion contributes to the dark matter abundance. We...
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Jordan Koechler (INFN Turin)Poster
We present a tuning of PYTHIA and a coalescence model that leads to realistic predictions of antinuclei production. This tuning is validated against LEP data including the fragmentation function of $b$-quarks into into $b$-hadrons, which is crucial for determining the $\bar{\Lambda}_b^0$ multiplicity. The coalescence model is tuned to ALICE data for the $\overline{\text{D}}$ and...
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Riccardo Natale (DESY)Poster
In this work, we study the cosmological implications of an initial displacement of the Peccei-Quinn breaking field generated during inflation and the subsequent oscillations of the field around its minimum. These oscillations induce a parametric resonance effect, leading to the exponential growth of perturbations. In our analysis, we employ lattice simulations to investigate the abundance of...
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Antoni Bertólez-Martínez (Departament de Física Quàntica i Astrofísica, Universitat de Barcelona)Poster
While electromagnetic couplings of UltraLight Dark Matter (ULDM) are the object of a wide range of experimental searches, there is no reason to believe that this is the only interaction of ULDM with the SM. In particular, the coupling with the SM weakly-interacting sector --neutrinos-- is much more unconstrained and leads to rich phenomenology.
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In this talk, we present the results from a... -
Yu-Ming Chen (Carleton University)Poster
We explore the big-bang nucleosynthesis (BBN) constraint on heavy neutrino that is a mixture of gauge singlet fermion and active neutrinos in the Standard Model. We work in the minimal model with only two parameters, the heavy neutrino mass $m_4$ and the mixing parameter $|U_{a4}|^2$, where $a=e$, $\mu$, or $\tau$ stands for the active neutrino flavor. We show that both the early universe...
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Sara Bianco (DESY-T Hamburg)Poster
Decays of relic particles into neutrinos can leave a strong imprint on the light elements formed during Big Bang Nucleosynthesis (BBN) if the decay happens before recombination. In this talk, I will discuss the effect of injecting neutrinos at lifetimes larger than 10⁴ s, focusing on the disintegration of the light elements. Several key processes are at play, including final-state radiation...
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Giuliano GiacalonePoster
Reducing uncertainties in theoretical evaluations of the nuclear matrix elements (NME) is crucial for designing and interpreting experiments aimed at discovering neutrinoless double beta decay. In this work, we identify a new class of observables, distinct from those employed in low-energy nuclear structure applications, that are strongly correlated with the values of the NME: momentum...
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Iman Shaukat AliPoster
Direct detection experiments lose sensitivity to light dark matter because of the small energy deposition in nuclear recoil events. Scenarios where dark matter is boosted to relativistic velocities thus provide a promising means to constrain sub-GeV dark matter particles. Cosmic-ray upscattering is a particularly appealing boosting mechanism as it does not require any assumptions beyond dark...
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Dr Lucia Duarte (Universidad de la República, Uruguay)Poster
The discovery of neutrino oscillations and masses provides strong motivation to extend the Standard Model by including right-handed neutrinos, which lead to heavy neutrino states that could exist at the electroweak scale. These states may also be influenced by new high-scale, weakly interacting physics. Incorporating right-handed neutrinos into an effective field theory framework -the...
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Francesco Pompa (University of L'Aquila, INFN LNGS & KIT)Poster
Neutrons constitute a major background in direct dark matter searches, yet previous measurements at LNGS have reported notable discrepancies in both flux values and energy spectra. These inconsistencies arise from variations in detector technologies, calibration methods, and energy windows used in different studies. Precise knowledge of this background is necessary to devise shielding and veto...
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Yilda Boukhtouchen (Queen’s University)Poster
Composite dark matter models, where dark matter exists in bound states formed in the early universe, have long been a source of scientific interest. I will focus on loosely bound dark matter composite states, where the binding energy per constituent is small compared to the constituent’s bare mass. If this binding energy is sufficiently small, scattering with Standard Model nuclei will...
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enrico scantamburloPoster
Establishing the physics potential of future colliders is one of the main objectives of the HEP community in the coming years. The aim is on the one hand to consolidate the physics expectations from a circular collider working between the Z-pole and the ttbar threshold (FCC-ee at CERN) and exploring completely new avenues and technologies such as a multi-TeV e+e- or even mu+mu- collider. In...
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Luighi Pierre Santos Leal (University of São Paulo, IFUSP / Université Paris-Saclay, IJCLab)Poster
The non-observation of heavy particles at the LHC suggests the existence of an energy gap between collider scales and the scale of new physics. Therefore, Effective Field Theories (EFTs) provide a useful framework to describe BSM effects. The study of diboson production, $pp\to VW$, and associated Higgs production with a vector boson $pp\to Vh$, where $V=Z,W$, provides powerful probes of EFTs...
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Şafak Çelik (Max Planck Institute for Astrophysics)Poster
In this study, we explore the dynamics of mixed dark matter scenarios, focusing on the interplay between cold dark matter (CDM) and warm dark matter (WDM) components. Utilizing perturbation theory techniques, we analyze the evolution of perturbations in a cosmological context where CDM constitutes the primary dark matter component, while WDM, characterized by a weakly interacting, thermally...
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Nicolas EsserPoster
Primordial black holes (PBHs) have been excluded from constituting the entirety of the dark matter (DM), except in the so-called 'asteroid-mass' range (between 10¹⁷ and 10²³ g) where they remain unconstrained. We present here observation-based constraints on PBHs in this previously open window, using photometric observations of local ultra-faint dwarf galaxies (UFDs) from the Hubble Space...
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Marko Pesut (University of Zürich)Poster
We illustrate the potential of a future high-intensity $e^+e^-$ collider running at the $Z$ pole in probing extensions of the Standard Model via precise measurements of flavor-changing processes. We illustrate this potential both within effective field theories and simplified models inspired by current $B$-physics data, focusing on selected flavor-physics measurement projections at FCC-ee, and...
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Duarte Da Silva FeiteiraPoster
Gravitational particle production provides an ever-present background in non-thermal dark matter studies. I discuss the correspondence between the Starobinsky and Bogolyubov approaches to the problem of inflationary particle production, and derive strong constraints on frameworks with scalar dark relics.
(Based on D. Feiteira, O. Lebedev, arXiv:2503.14652)
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Karen Macias Cardenas (Instituto de Fisica Teorica (UAM-CSIC))Poster
In this poster, I present a dark matter model that couples to the standard model through a one-loop interaction with neutrinos, where the mediator particles also generate neutrino masses. We perform a global fit that incorporates dark matter relic abundance, primordial nucleosynthesis, neutrino mass, collider and indirect detection constraints. Thanks to the loop suppression, large couplings...
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Francesco CostaTalk
The Standard Model (SM) leaves several fundamental questions unanswered. Traditionally, searches for new physics have focused on the TeV scale, but the lack of discoveries has motivated a shift toward exploring sub-GeV dark sectors as more viable extensions of the SM.
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In this context, the PTA detection of a stochastic gravitational wave background (SGWB) in the nanohertz range offers a new... -
Simone Meoni (INFN, University of Bologna (IT))Poster
Axion-like particles (ALPs) are hypothetical pseudoscalar states that emerge as pseudo-Nambu-Goldstone bosons from the breaking of an approximate global $ U(1) $ symmetry. They appear in several extensions of the Standard Model, offering potential solutions to the strong CP problem, the muon $g-\!2$ anomaly, neutrino mass generation, and dark matter. While most collider-based studies focus on...
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Jan Ramaj (Comenius University (SK))Poster
In this poster, we present a systematic bottom-up approach to effective field theory based on a minimal set of effective operators that lead to lepton number asymmetry generation. This process occurs simultaneously with dark matter production. A key component of the minimal scenario is the Weinberg operator, which contributes to both leptogenesis and neutrino masses. However, we show that the...
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Indrajit Ghose (S N Bose National Centre for Basic Sciences)Poster
Neutrino oscillation clearly establishes the evidence of physics beyond the Standard Model (BSM). The Long Baseline Program has probed the phenomenology of neutrinos to unprecedented accuracy [1]. Next generation experiments like DUNE can study the propagation of flavor eigenstates on curved spacetime [2]. Neutrino oscillation in a Core-Collapse supernova (CCSN) on the other hand has a huge...
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Carlo Tasillo (Uppsala University)Poster
Strong first-order phase transitions offer a compelling explanation for the stochastic gravitational wave background in the nano-Hertz range measured by pulsar timing arrays (PTA). In this talk, I will consider a classically conformal dark sector in which the breaking of a dark U(1) gauge symmetry gives rise to a gravitational wave background that can fit the PTA data and additionally sources...
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Nabeen BhusalPoster
The transition between cosmic inflation to a phase of radiation domination, e.g. reheating, is an essential ingredient of any theory of inflation. The reheating stage is typically characterized by an inflaton oscillating about the minimum of its potential. Such dynamics, inducing the growth of inhomogeneities and non-perturbative dynamics have been shown to be relevant for a reheating stage...
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Sri Sankari Alias Sowmiya Balan (Karlsruhe Institute of Technology)Poster
Models of Sub-GeV dark matter coupled to a dark photon with kinetic mixing feature a rich phenomenology. They are thus constrained by a number of laboratory, astrophysical and cosmological observations. The biggest obstacle for fermionic DM particles to make up all of the observed DM comes from the strong constraints placed by the CMB and X-ray emission on DM annihilation. This can be overcome...
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Dr Yu Hamada (DESY)Poster
Domain wall (DW) networks may have formed in the early universe following the spontaneous breaking of a discrete symmetry. Notably, several particle physics models predict the existence of current-carrying DWs, which can capture and store particles as zero modes on it. In this study, we demonstrate that gravitational waves (GWs) generated by current-carrying DWs with fermionic zeromodes...
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Katarina BleauPoster
During a neutron star's formation in a supernova, its core may undergo a phase transition into deconfined quark matter. The phase transition would likely be first-order, proceeding by bubble nucleation. We show that such a phase transition would be accompanied by the emission of high-frequency gravitational waves (MHz band), which could be within reach of proposed gravitational wave detectors....
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Bruno Eduardo (University of Sao Paulo)Poster
An effective Lagrangian is composed of all higher dimensional operators that are Lorentz singlets and invariant under the gauge symmetries of the theory, suppressed by powers of the cutoff. A challenging problem is the construction of the EFT operators, since the number of possibilities grows extremely fast. Furthermore, many of these operators are linearly dependent or can even be discarded,...
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Giona Sala (RWTH Aachen University)Poster
The observation of gravitational waves (GWs) from dark sirens provides a novel measurement, complementary to other surveys that are electromagnetic (EM) signal–based. Under the assumption that both observations trace the distribution of matter up to some bias parameters, it is possible to infer cosmological parameters by cross-correlating their density maps.
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As the number of resolved GW... -
Yeray Garcia Del CastilloPoster
Axions and Axion-Like-Particles (ALPs) are theoretically well-motivated candidates for dark matter that, due to their large occupation number, can be described as oscillating classical fields. These particles may feature a quadratic interaction with ordinary matter which can modify the field's dynamics in the vicinity of such objects, inducing a very interesting phenomenology. In this talk, I...
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Vinicius OliveiraPoster
We study the Higgs boson decay into dark matter (DM) in the framework of freeze-in at stronger coupling. Even though the Higgs-DM coupling is significant, up to order one, DM does not thermalize due to the Boltzmann suppression of its production at low temperatures. We find that this mechanism leads to observable Higgs decay into invisible final states with the branching fraction of 10% and...
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Martha Ulloa Calzonzin (University of Florida)Poster
We introduce a new mechanism where we claim that the Charge-Parity (CP) violation from mechanisms within the Standard Model (SM) is enough to generate the observed baryon asymmetry of the universe—an achievement that no other currently proposed mechanism can match. We use a Mesogenesis framework where the CP violation comes entirely from Standard Model contributions to neutral meson systems....
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Maximilian Volker BerbigPoster
Motivated by the hint for time-dependent dynamical dark energy from an analysis of the DESI Baryon Accoustic Oscillation (BAO) data together with information from the Cosmic Microwave Background (CMB) and Supernovae (SN), we relax the assumption of a vanishing initial velocity for a quintessence field. In particular we focus on pseudo-Nambu-Goldstone-Boson (PNGB) quintessence in the form of an...
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Mario Fernandez Navarro (University of Glasgow)Poster
In this talk I discuss the constraints imposed by BBN and CMB observations on primordial lepton flavour asymmetries with (approximately) vanishing total lepton number. I show that solving the momentum averaged quantum kinetic equations describing neutrino oscillations and interactions is an accurate approximation to the full momentum-dependent system, and the results reveal a rich flavour...
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Damon Cleaver (King's College London)Poster
Ultra-heavy dark matter is a class of candidates for which direct detection experiments are ineffective due to the suppressed dark matter flux. We explore the potential of large underwater acoustic arrays, developed for ultra-high energy neutrino detection, to detect ultra-heavy dark matter. As ultra-heavy dark matter traverses seawater, it deposits energy through nuclear scattering,...
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Rajesh ChakrabartyPoster
Rare baryonic decays induced by flavour changing neutral current (FCNC) have been of immense interest in recent years because of their sensitivities towards new physics (NP) beyond the standard model (SM). The exploration had been triggered with the observation of $b \rightarrow ll$ transition at the Fermilab [1] and the LHCb [2]. Theoretically these decays are also studied at different NP...
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Anna Socha (LPENS & Sorbonne University)Poster
In many theoretical models, the observed matter-antimatter asymmetry originates from out-of-equilibrium decays and scatterings of heavy particles. In these scenarios, charge-parity (CP) symmetry violation arises perturbatively through the interference between tree-level and one-loop diagrams. As a result, the CP asymmetry, characterized by the parameter $\epsilon$, is suppresed by higher...
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Alessia Musumeci (Technical University of Munich)Poster
Pulsar Timing Arrays (PTAs) have gathered strong evidence for the existence of a Stochastic Gravitational Wave Background at nanohertz frequencies. A possible astrophysical explanation of the signal is the production of Gravitational Waves (GWs) from the merging of Supermassive Black Hole Binaries, but many different explanations, which invoke new physics beyond the Standard Model, have been...
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Riya Barick (S. N. Bose National Centre for Basic Sciences)
In curved spacetime, neutrinos experience an extra contribution to their effective Hamiltonian from a four-fermion interaction induced by spacetime geometry, specifically by torsion. This interaction is parity-violating, non-universal, and diagonal in the mass basis, and thus causes neutrino mixing while propagating through a fermionic matter background. It can significantly influence neutrino...
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Ms Riya Barick (Satyendra Nath Bose National Centre for Basic Sciences)Poster
Abstract :
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In curved spacetime, neutrinos experience an extra contribution to their effective Hamiltonian from a four-fermion interaction induced by spacetime geometry, specifically by torsion. This interaction is parity-violating, non-universal, and diagonal in the mass basis, and thus causes neutrino mixing while propagating through a fermionic matter background. It can significantly... -
Nico Stirling (University of Helsinki)Poster
A novel approach to neutrino oscillations is presented, which is analogous to birefringence. Neutrinos propagate as massless waves undergoing coherent forward flavour changing scattering off the quantum vacuum. The resulting coherent wave obeys a flavour mixing wave equation leading to; the standard oscillation probabilities, a universal effective refractive mass and a unique group velocity...
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DHRUV PASARI (Durham University)Poster
The phenomenon of neutrino oscillations in the presence of large extra dimensions (LED) has been extensively studied since its proposal, with numerous efforts made to constrain the size of said extra dimensions using oscillation data. In this work, we extend the standard LED framework by considering warped extra dimensions and incorporating a Majorana mass term for the bulk fermions. We...
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Andrea Sainaghi (University of Padua)Poster
Flavor deconstruction refers to a framework where the three fermion families are charged under non-universal gauge groups. Such Standard Model extensions have been proven to be capable of explaining flavor hierarchies among charged fermions. Recently, it has been shown that also neutrino anarchy can be realized within flavor-deconstructed models exploiting a seesaw mechanism. The present work...
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Enrico Perboni (DESY)Poster
Cosmological phase transitionscan give rise to intriguing phenomena, such as baryogenesis or a stochastic gravitational wave background, due to nucleation and percolation of vacuum bubbles in the primordial plasma. A key parameter for predicting these relics is the bubble wall velocity, whose computation relies onsolving the Boltzmann equations of the various speciesalong the bubble profile....
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George ParkerPoster
Double beta decay and double electron capture (2𝜈ββ and 2𝜈ECEC) have already experimentally observed. With renewed interest towards detecting the positron-emitting double beta decays (2𝜈β+β+ and 2𝜈β+EC) with exciting new detector technologies, we ask what we could learn from observing the neutrinoless analogues (0𝜈β+β+ and 0𝜈β+EC). In particular, the combination of these other modes with 0𝜈ββ...
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Nicolas Grimbaum Yamamoto (Université Libre de Bruxelles)Poster
Among the few methods to probe the early Universe through the observation of primordial particles, one possibility remains relatively unexplored: the detection of high-energy neutrinos emitted shortly after the Big Bang, originating from the decay or annihilation of early-Universe relics.
We present a general study of this scenario. First, we emphasise that such neutrinos could exhibit...
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Théo Paré (LUPM)Poster
We explore the gravitational heating of exoplanetary systems by dark matter substructures of different kinds (primordial black holes -- PBHs, ultra-compact -- UCMHs, or classical subhalos). In this context, the scales of the dark objects probed are of the same order as the orbital radii of planets of interest. Distant exoplanets are quite sensitive to heating processes because less bound to...
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Justyna Mędrala-Sowa (Jagiellonian University)Poster
Positronium (Ps), an exotic atom composed of an electron and a positron, is an ideal system for testing Quantum Electrodynamics (QED) and probing potential extensions of the Standard Model (SM), including dark matter candidates such as mirror matter. Mirror matter theories predict that ortho-positronium (o-Ps) could oscillate into an invisible mirror state, leading to deviations in its...
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Onur YonarPoster
Abstract
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Onur Yonar
The electromagnetic properties of Majorana fermions are stringently constrained, allowing only
the presence of an anapole moment. We investigate the radiative interactions of spin-3/2 Majorana
fermions with the photon. From supergravity, the gravitino emerges as a prototypical example
of such a particle. We calculate one-loop form factors of the LSP gravitino in N = 1... -
Walter Rodríguez (Pontificia Universidad Catolica del Peru)Poster
A recast is developed for a search for non-pointing, delayed photons originating from the decay of a neutral long-lived particle (LLP) produced via an effective coupling in Higgs decays within the ATLAS detector. The LLP decays in the inner detector, producing an invisible particle and the signal photon. The analysis includes a refined calculation of non-pointing parameters, taking into...
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Tenta Tsuji (KEK Theory Center)Poster
In modern cosmology, it is generally assumed that after inflation, the energy of the inflaton field is transferred to radiation through a process known as reheating.
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axion-like particle (ALP) have recently gained attention as potential inflaton candidates, as they naturally preserve the flatness of the inflaton potential due to their shift symmetry.
In our work, we explore the reheating... -
Margaux Jomain (LAPTh)Poster
Thermal Dark Matter (DM) below the GeV scale faces strong cosmological and astrophysical constraints, with Cosmic Microwave Background (CMB) observations excluding s-wave annihilation cross-sections for thermal DM below 10 GeV. Such limits can be evaded with velocity dependent cross-sections, for example when DM annihilates near a narrow resonance. In this work, we explore the impact of...
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Martina Cataldi (University of Hamburg)Poster
The matter-antimatter asymmetry of the Universe represents one of the main open questions in particle physics and cosmology. In this talk, we will present a novel realization of cold baryogenesis, a mechanism involving the formation and decay of Standard Model SU(2)-textures, that relies on the out-of-equilibrium dynamics during a strong first order electroweak phase transition. By performing...
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DWAIPAYAN MUKHERJEE (Tata Institute of Fundamental Research)Poster
A dense neutrino gas can exhibit collective flavor oscillations, driven by neutrino–neutrino forward scattering, which profoundly affect flavor evolution in core-collapse supernovae and the early Universe. While numerous studies have shown that a zero crossing in the difference of flavor distributions ($g_{\Gamma}$) of neutrinos determines the existence and character of instabilities, a...
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Bradley Shapiro (Dartmouth College)Poster
Superradiance can cause the axion cloud around a rotating black hole to reach extremely high densities, and the decay of these axions can produce a powerful laser. The electric field of these lasers is strong enough that the Schwinger effect may become significant, resulting in the production of an electron-positron plasma. Here, I detail the dynamics between axion lasers and this...
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Takuya OkawaPoster
The Standard Model of particle physics does not explain the origin of the universe’s baryon asymmetry or its primordial fluctuations. The Affleck-Dine mechanism is a well motivated scenario for generating the baryon asymmetry through the post-inflationary dynamics of a complex scalar field with baryon number. The curvaton mechanism is a popular approach for producing curvature perturbations...
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Leonie EinfaltPoster
SABRE is an international collaboration that will operate similar particle detectors
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in the Northern (SABRE North) and Southern Hemispheres (SABRE
South). This innovative approach aims to distinguish potential dark matter
signals from seasonal backgrounds: a pioneering strategy only feasible with a
Southern Hemisphere experiment. SABRE South is located at the Stawell Underground
Physics... -
Killian Bouzoud (SUBATECH)Poster
The axion is a hypothetical particle first proposed by Peccei, Quinn, Weinberg and Wilczek to solve the strong CP problem. It was later realized that ultra-relativistic (or "hot") axions thermally produced in the early Universe can contribute measurably to the energy density of the Universe as dark radiation.
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The effective number of neutrinos Neff, parametrizing this dark radiation fraction... -
Dr Peter Matak (Comenius University (SK))Poster
We present a bottom-up approach to an effective theory that simultaneously explains the matter–antimatter asymmetry via leptogenesis, the dark matter relic abundance via freeze-in or freeze-out mechanisms, and neutrino masses via the Weinberg operator. We show that, in the minimal scenario, only two new particles and a single portal operator coupling the visible and dark sectors are sufficient...
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Pietro GhediniPoster
We investigate the clustering of neutrinos on both galactic and extragalactic scales, with the aim of probing their standard and non-standard properties. We focus on potential signatures of neutrino–dark matter interactions, which could imprint detectable features on the local distribution of cosmological neutrinos. Our phenomenological approach aims to produce testable predictions for future...
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Christian Forstner (Technical University of Munich)Poster
Sterile neutrinos are a minimal extension of the Standard Model of particle physics and a promising candidate for dark matter if their mass is in the keV-range. After the completion of the neutrino mass measurement campaign, the Karlsruhe Tritium Neutrino experiment (KATRIN) will be equipped with a novel multi-pixel silicon drift detector array, the TRISTAN detector. It will be capable of...
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Mathieu GROSSPoster
Usual relativistic freeze out in radiation domination is constrained by the accident that na^{3} is independant on the temperature which limit the mass of the dark matter to a narrow range around 100 eV. In this poster I will Show how the reheating era can open the parameter space to this possibility.
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Viktor Zaujec (Comenius University in Bratislava)Poster
Various asymmetry-generating mechanisms are typically based on underlying reactions, such as decays or scatterings. In this contribution, however, we emphasize the essential role of CP invariants, from which a complete list of asymmetry-generating processes can be systematically derived. As a demonstration, we consider an asymmetric dark matter model based on a discrete $\mathbb{Z}_3$...
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José Filipe Bastos (CFTP, Instituto Superior Técnico, Universidade de Lisboa)Poster
Even though a fourth chiral generation of fermions is experimentally ruled out, the possibility of extending the SM with vector-like quarks (VLQs), where both chiral components transform the same way under SU(2)_L cannot be excluded. In particular, extensions of the SM involving isodoublet vector-like quarks with standard charges currently stand as the favoured candidate in explaining the...
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