-
Peisi Huang28/09/2026, 09:30
In this talk, I will discuss how a phase transition changes the dark matter properties and the related phenomenology.
Go to contribution page -
Jiheon Lee (KIAS)28/09/2026, 10:00
There is tentative evidence that the cores of the massive neutron stars consist of quark matter. I will discuss that the formation of such a quark-matter core during a galactic supernova could be accompanied by gravitational wave emission in the MHz band, sourced by the QCD phase transition. These signals constitute a new target for high-frequency gravitational wave detectors, suggesting they...
Go to contribution page -
Yannis Georis28/09/2026, 11:00
The ordinary and dark matter in the Universe may share a common origin in the framework of a minimal extension of the Standard Model by three right-handed neutrinos. A pair of such heavy neutral leptons (HNLs) can give masses to neutrinos, generate the baryon asymmetry at the electroweak scale and produce a large lepton asymmetry at the QCD scale, which is then resonantly transformed into an...
Go to contribution page -
Dr Chen Yang28/09/2026, 11:30
Understanding the microscopic origin of primordial fluctuations remains a central challenge in inflationary cosmology. In this talk, I will explore a scenario where curvature perturbations interact with a strongly coupled sector known as unparticles. This setup allows for analytic control of cosmological correlators and reveals novel bispectrum shapes with distinctive phenomenological...
Go to contribution page -
Dr ARTURO DE GIORGI28/09/2026, 14:00
Massive astrophysical objects can support large, quasi-static scalar-field configurations. When such an object collapses into a black hole, for example in a core-collapse supernova, the field abruptly loses its source and is released as a propagating burst, a "scalar tsunami". Previous studies showed that individual bursts could be detectable on Earth, but only for sufficiently nearby sources...
Go to contribution page -
VALENTIN,V KHOZE28/09/2026, 14:301
-
Wenyuan Ai28/09/2026, 15:00
In one of his final papers, Steven Weinberg, together with Raphael Flauger, asked whether gravitational waves can be attenuated through their interactions with matter. They argued that no attenuation occurs, owing to a cancellation between graviton absorption and stimulated emission, as inferred from leading-order soft-graviton arguments. In this talk, I revisit this reasoning and show that it...
Go to contribution page -
Dr Kiyoharu Kawana (KIAS)28/09/2026, 16:00
It is widely believed that exact global symmetries cannot exist in a consistent theory of quantum gravity. Euclidean wormholes, in particular, are generally thought to generate local symmetry-violating operators in the low-energy effective action, potentially leading to a serious axion quality problem. In this talk, I carefully revisit this argument and show that, when the wormhole-induced...
Go to contribution page -
Kierthika Chathirathas28/09/2026, 16:30
Pre-inflationary axion cosmologies admit a broad range of initial velocities and angles that generate a landscape of misalignment histories, whose nonlinear fate and small-scale structure remain uncertain. We use lattice simulations to follow the QCD axion in the kinetic misalignment scenario through the QCD crossover into the non-relativistic regime, towards matter-radiation equality. In the...
Go to contribution page -
Takafumi Aoki (ICRR, The University of Tokyo)28/09/2026, 17:00
Instanton effects in gauge theories with spontaneously broken gauge symmetries are relevant to several phenomenological settings, including electroweak baryon-number violating processes and nonperturbative contributions to axion physics. In such theories, the relevant configurations are not exact classical minima of the action, so evaluating their effects requires some care. Earlier work...
Go to contribution page -
Ko Hirooka (ICRR, the University of Tokyo)28/09/2026, 17:15
Grand Unified Theories (GUTs) predict the unification of Yukawa couplings at high energies, but reproducing the observed flavor structure of the Standard Model (SM) remains challenging.
In this talk, we propose a renormalizable SU(5) GUT with the Froggatt–Nielsen (FN) mechanism, in which the SM Yukawa couplings are naturally explained by introducing heavy FN fermions. We further show that...
Go to contribution page -
Hengameh Bagherian (University of Chicago)29/09/2026, 09:30
We propose a natural framework for interacting dark matter and dark energy based on axion–monopole dynamics in a dark gauge sector. Dark matter is composed of dark ’t Hooft–Polyakov monopoles, while dark energy is an ultralight axion whose coupling to the dark gauge field induces an axion-dependent dyon mass through the Witten effect. This generates a direct dark matter–dark energy...
Go to contribution page -
Sung Hak Lim (IBS CTPU-PTC)29/09/2026, 10:00
Machine learning (ML) has become a powerful tool for scientific research, and its effectiveness can be further enhanced by incorporating physical knowledge directly into the learning process. Physics-informed machine learning is a broad class of ML methods in which such knowledge is embedded in the choice of inputs, model architecture, or learning objective. In this talk, I will present...
Go to contribution page -
Melissa Diamond29/09/2026, 11:00
Dark matter searches often focus on a single interaction between dark matter and the Standard Model. However, any tree level interaction between the dark sector and any Standard Model particle can lead to many additional loop level interactions with many other Standard Model particles. In this talk, I will show how dark matter which interacts with nuclei automatically gains interactions...
Go to contribution page -
Zachary Bogorad (Fermilab)29/09/2026, 11:30
A terrestrial population of millicharged particles can arise if they constitute a subcomponent of dark matter, or if sufficiently light millicharged particles are produced in cosmic-ray air showers. Through repeated scattering with ordinary matter, these particles thermalize to terrestrial temperatures in Earth’s environment. I will show that a simple electrified shell, such as a Van de Graaff...
Go to contribution page -
Dr Shigeki Matsumoto (Kavli IPMU)29/09/2026, 14:00
MeV gamma-ray astronomy is entering a new era, with several future missions opening a largely unexplored window for dark matter searches. In this talk, I will discuss well-motivated dark matter candidates associated with seesaw scenarios for neutrino mass generation and leptogenesis. I will first review sterile-neutrino dark matter in the Standard Model extended by right-handed neutrinos,...
Go to contribution page -
Daniel Naredo (KIT)29/09/2026, 14:30
The majoron is the Nambu-Goldstone boson associated with the spontaneous breaking of a global $B-L$ symmetry. Remarkably, the minimal majoron framework can simultaneously address three key empirical indications of physics beyond the Standard Model: neutrino masses, the matter-antimatter asymmetry, and dark matter. In this work, we identify the cosmologically viable region in which majoron dark...
Go to contribution page -
Kevin Langhoff29/09/2026, 15:00
It is often claimed Standard Model CP violation is insufficient for baryogenesis. We present a counterexample using minimal flavor violation (MFV) in which all CP-violating effects arise from the
Go to contribution page
Cabibbo-Kobayashi-Maskawa (CKM) matrix. Our scenario involves a leptoquark field with MFVpreserving interactions whose decays to Standard Model particles yield the observed baryon asymmetry in the... -
Prof. Shao-Feng Ge (TDLI-SJTU)29/09/2026, 16:00
The neutrino oscillation involves two charged-current interaction vertices for the neutrino production and detection processes, each with a PMNS matrix element. Assuming these two PMNS mixing matrices to be the same, which is the usual case in the SM at the tree level, the oscillation probability is unitary. However, these two PMNS matrices can be different in the presence of RG running due to...
Go to contribution page -
Joerg Jaeckel (Institut fuer theoretische Physik, Heidelberg University)29/09/2026, 16:30
This talk will discuss a few tests of new physics beyond the Standard Model, with precision probes (e.g. atoms and ions) but also exploit the power of astrophysics for the same purpose.
Go to contribution page -
Subaru Fujisawa (Kavli IPMU)29/09/2026, 17:00
Majoron dark matter models are well motivated since they can provide a framework for explaining tiny neutrino masses and the baryon asymmetry of the Universe through leptogenesis. Conventional majoron models are based on a global U(1)_{B-L} symmetry. However, global symmetries are generally expected to be explicitly broken by quantum-gravity effects, making it difficult to theoretically...
Go to contribution page -
Youngho Go (KAIST)29/09/2026, 17:15
To date, most of the observables of particle physics have been only sensitive to the local Lie algebra of its gauge group. Recently, the importance of global aspects of gauge groups has begun to be widely appreciated, and the demand for their systematic study is emerging. The global structure ambiguity of the Standard Model gauge group is a good example. This strongly motivates a comprehensive...
Go to contribution page -
Rodrigo Alonso De Pablo30/09/2026, 09:30
We use generalised symmetries to study the shape and size of the CP violating theta parameter space. This study is then used to look at axion couplings and their dependence on the global structure of the SM group.
Go to contribution page -
Dr Ravneet Bedi (KAIST)30/09/2026, 10:00
We propose a solution to the strong CP problem that specifically relies on massless quarks and has no light axion. The QCD color group $SU(3)_c$ is embedded into a larger, simple gauge group (grand-color) where one of the massless, colored fermions enjoys an anomalous chiral symmetry, rendering the strong CP phase unphysical. The grand-color gauge group $G_{\rm GC}$ is Higgsed down to...
Go to contribution page -
Prof. Jörn Andreas Kersten30/09/2026, 11:00
We use the latest LIGO-Virgo-KAGRA data to search for a stochastic
Go to contribution page
gravitational wave background from a first-order phase transition in the early Universe. We discuss the prior dependence in Bayesian inference approaches. We apply the results to constrain the parameters of a dark sector Abelian Higgs model. -
Tenta Tsuji (KEK Theory Center)30/09/2026, 11:30
Gravitational waves provide a unique probe of the Universe before the CMB. Two generic gravitational-wave sources are expected in the formation of the hot Big Bang. First, a thermal plasma inevitably emits gravitational waves because gravity couples universally to the energy-momentum tensor, providing a gravitational counterpart of thermal radiation such as the CMB. Second, if inflation...
Go to contribution page -
Heechan Yi (Yonsei University)30/09/2026, 11:45
High-frequency gravitational waves (HFGWs) provide a unique window into high-energy and early-universe physics, yet they evade traditional macroscopic interferometry.
Go to contribution page
To bridge this detection gap, we propose a novel quantum-sensing paradigm utilizing superconducting transmon qubits embedded in resonant microwave cavities.
Through the inverse Gertsenshtein effect, HFGWs propagating in a... -
Mr Aritra Bal (Karlsruhe Institute of Technology)01/10/2026, 09:30
-
Oleg Titov (TDLI)01/10/2026, 10:00
The talk is devoted to the role of excited final nuclear states in WIMP-nucleus scattering. We generalize the formalism of non-relativistic effective field theory to inelastic scattering and apply the state-of-the-art Relativistic Configuration-interaction Density functional theory to evaluate the event rates in direct detection experiments. We show that for certain interaction operators, the...
Go to contribution page -
Iwan Morton-Blake (Tsung-Dao Lee Institute / Shanghai Jiao Tong University)01/10/2026, 11:00
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kton liquid scintillator detector located in southern China. Its primary goal is the determination of the neutrino mass ordering through precision measurements of reactor antineutrino oscillations at a baseline of 52.5 km. In addition, JUNO will deliver world-leading measurements of neutrino oscillation parameters while pursuing a...
Go to contribution page -
Prof. Seodong Shin (Jeonbuk National University)01/10/2026, 11:30
We investigate solar-neutrino spin–flavor precession (SFP) induced by magnetic moments
Go to contribution page
in the three-active-flavor framework. For Majorana neutrinos, SFP can convert solar neu-
trinos into antineutrinos of different active flavors. In the Dirac case, SFP instead produces
sterile right-handed states and can lead to the disappearance of active neutrinos. Using
the full 6 × 6 Hamiltonians and... -
Mr Philip Lu (KIAS)01/10/2026, 14:00
Primordial black holes (PBHs) can arise in a wide range of early Universe scenarios, from inflation to first-order phase transitions (FOPTs). In the first part of this talk, I will discuss PBH formation in FOPTs, where dark sector particles trapped in the old phase form compact remnants called thermal balls that can evolve into Fermi balls and collapse into PBHs. Slow cooling of these remnants...
Go to contribution page -
JungHwan Lee (Seoul National University)01/10/2026, 14:30
In this talk, I will present a quantum Clausius relation for conformal fields inside the apparent horizon of a quasi de Sitter spacetime. We calculate the net horizon heat flow from the renormalized stress-energy tensor from trace anomaly of Weyl symmetry and independently evaluate the evolution of the renormalized von Neumann entropy using the replica method. At leading order in the...
Go to contribution page -
Yushi Mura01/10/2026, 15:00
Electroweak baryogenesis, a scenario for explaining the matter-antimatter asymmetry of the Universe, requires a description of particle transport in a nonequilibrium plasma in the presence of a spacetime-dependent bubble-wall background. This transport is usually described by Boltzmann equations in the quasiparticle picture, where a CP-violating background modifies the quasiparticle...
Go to contribution page -
Alfredo Aranda01/10/2026, 16:00
A model with two Higgs SU(2) doublets and a Z3 flavor symmetry is shown to generate an enhancement of its charged Higgs coupling to c and b quarks. The enhancement allows the model to reproduce the ATLAS excess associated to the process H ± → bc for a charged Higgs mass of 130 GeV, and considering a potential search at the future LHeC, the analysis suggests viability for its detection.
Go to contribution page -
Prof. Mihoko Nojiri (Theory Center, IPNS, KEK)01/10/2026, 16:301
-
Yaxuan Wen01/10/2026, 17:00
We study the magnetic flux structure of metastable cosmic strings arising from multi-step symmetry breaking in an extended gauge theory. We show that the ordering of the final symmetry breaking and string decay determines whether the flux is confined within the string or not. We discuss the implications of these results for cosmic string dynamics and gravitational-wave signatures.
Go to contribution page -
Jaeyoung Park (Seoul National University)01/10/2026, 17:15
There are many astrophysical environments in the Universe where the local dark matter density may be significantly enhanced. Variable stars located in such environments may provide a probe of high-density dark matter. In this work, the resonant conversion of meV-scale dark photon dark matter into photons inside stars is studied. The resulting additional energy injection can affect the...
Go to contribution page -
Xiao-Gang He02/10/2026, 09:30
We study thermal leptogenesis in three predictive type-I seesaw models in which the neutrino Dirac mass matrix is equal to the mass matrix of up-type quarks, Model A, or down-type quarks, Model B, or charged leptons, Model C. In this framework, the seesaw relation permits a full reconstruction of the heavy right-handed neutrino mass matrix from low-energy neutrino parameters, which greatly...
Go to contribution page -
Jinn-Ouk Gong02/10/2026, 10:00
-
Peter Roland Majcen (Karlsruhe Institute of Technology)02/10/2026, 11:00
Tensor-network methods provide a powerful framework for studying equilibrium and nonequilibrium properties of low-dimensional quantum many-body systems. In this talk, I will discuss the application of tensor-network methods to Hamiltonian lattice gauge theories, focusing first on the dressed-site formalism, the algorithmic construction of its local gauge-invariant basis, and systematic and...
Go to contribution page -
Satoshi Shirai (Kavli IPMU)02/10/2026, 11:30
Recent pulsar timing array (PTA) observations have provided indications of a stochastic gravitational-wave (GW) background in the nanohertz frequency band, stimulating intense interest in its possible origin. Among proposed beyond-the-Standard-Model explanations, models based on metastable cosmic strings have been found to fit current PTA data relatively well. When these strings decay, they...
Go to contribution page -
Shotaro Ieyasu02/10/2026, 12:00
Explaining the baryon asymmetry through leptogenesis requires a sufficiently high reheating temperature. Conventional analyses have obtained a lower bound of $10^{10}\,\mathrm{GeV}$ within specific regions of parameter space fixed by hand. However, the lower bound in the general parameter space remains unclear. In particular, it may be possible to lower the reheating temperature arbitrarily...
Go to contribution page -
Sungjung Kim02/10/2026, 12:15
In this talk, I will study training failure of neural networks on sparse parity, a standard minimal model in machine learning theory. Trainability on this task turns out not to be monotone in problem size. This happens because parts of the data push training away from the correct solution, a phenomenon we call false learning. When these reversed updates resonate, they build a barrier in the...
Go to contribution page -
Hualin Mei (Tsung-Dao Lee Institute (CN))
TRIDENT is a next-generation deep-sea neutrino telescope under development in the South China Sea, designed to explore the high-energy Universe through the detection of astrophysical neutrinos. By instrumenting a multi-cubic-kilometer volume with optical sensors optimized for excellent photon collection and directional reconstruction, TRIDENT aims to enable precision neutrino astronomy, probe...
Go to contribution page
Choose timezone
Your profile timezone: