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Agata Trovato23/05/2022, 09:30
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Siyuan Chen23/05/2022, 10:00
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Angelo Ricciardone23/05/2022, 10:40
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Eleni Bagui (Université Libre de Bruxelles (ULB)), Henrique Rubira, Juan Urrutia, Maciej Kierkla, Matteo Braglia (IFT UAM-CSIC), Noam Levi (Tel Aviv University)23/05/2022, 11:10
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23/05/2022, 11:40
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Miguel Zumalacárregui23/05/2022, 14:00
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Elisa Chisari23/05/2022, 14:30
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François Lanusse23/05/2022, 15:15
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David Benisty (Cambridge University), Matteo Lucca (ULB, Bruxelles), Melissa Joseph, Nikki Arendse (Oskar Klein Centre, Stockholm University), Sveva Castello (University of Geneva), Wenzer Qin (MIT)23/05/2022, 15:45
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23/05/2022, 16:15
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Gianfranco Bertone23/05/2022, 16:45
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Bibhushan Shakya24/05/2022, 09:30
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Alex Millar24/05/2022, 10:00
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Sebastian Ellis24/05/2022, 10:45
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Anastasia Sokolenko, Carlos Blanco, Cem Eroencel, Jose Luis Bernal Mera, Nicklas Ramberg (Johannes gutenberg universität Mainz), Silvia Manconi (Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen), Sonali Verma, Yi-Peng Wu (Laboratoire de Physique Théorique et Hautes Énergies (LPTHE))24/05/2022, 11:15
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24/05/2022, 11:55
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Shashank Shalgar24/05/2022, 14:00
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Raghuveer Garani (INFN, Florence)24/05/2022, 14:30
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Annika Rudolph24/05/2022, 15:15
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Federica Pompa, Ian Padilla-Gay (University of Copenhagen - Niels Bohr Institute), Mahmoud Al-Awashra, Miguel Gutierrez, Ottavio Fornieri (GSSI), Xiao Xue (II. Institute of Theoretical Physics, Universitat Hamburg)24/05/2022, 15:45
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24/05/2022, 16:15
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Raffaele D'Agnolo25/05/2022, 09:30
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Ricardo Zambujal Ferreira25/05/2022, 10:00
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Jessica Turner25/05/2022, 10:45
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Eloy de Jong (King's College London), Julia Gehrlein, Lucas Pinol, Marco Matteini (Jožef Stefan Institute), Yannis Georis25/05/2022, 11:15
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25/05/2022, 11:45
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Gianfranco Bertone25/05/2022, 14:00
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Eleni Bagui (Université Libre de Bruxelles (ULB))gravitational waves
Primordial black holes (PBHs) with a wide mass distribution imprinted by the thermal history of the Universe, which naturally produces a high peak at the solar mass scale, could explain the gravitational-wave events seen by LIGO/Virgo and up to the totality of the dark matter. We show that compared to monochromatic or log-normal mass functions, the gravitational wave backgrounds (GWBs) from...
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Sonali Vermadark matter
Present and upcoming neutrino experiments can have considerable sensitivity to dark sectors that interact feebly with the Standard Model. We consider light dark sectors (DS) interacting with the SM through well-motivated irrelevant portals. We derive bounds on such scenarios using the decay of dark sector excitations inside the neutrino detector, placed downstream from the target. Our approach...
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Miguel Gutierrezparticle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
High energy cosmic rays reach the solar surface and induce a signal that could be observed in up to five different channels: (i) a cosmic ray shadow (HAWC has measured its energy dependence); (ii) a flux of gamma rays (observed by Fermi-LAT up to 200 GeV); (iii) a flux of high energy neutrons (unfortunately, there are no hadronic calorimeters in space); (iv) a muon shadow (detected by...
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Melissa Josephlate universe (including CMB, dark energy, astrostatistics)
As cosmological data have improved, tensions have arisen. One such tension is the difference between the locally measured Hubble constant $H_0$ and the value inferred from the cosmic microwave background (CMB). Interacting radiation has been suggested as a solution, but studies show that conventional models are precluded by high-$\ell$ CMB polarization data. It seems at least plausible that a...
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Cem Eroenceldark matter
Axion-like-particle (ALP) is a well-motivated candidate for dark matter, and it has been subject to extensive theoretical and experimental research in recent years. The most popular ALP production mechanism studied in the literature is the misalignment mechanism, where the ALP field has negligible kinetic energy initially, and it starts oscillating when its mass becomes comparable to the...
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Federica Pompaparticle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
Supernova (SN) explosions are the most powerful cosmic factories of all-flavors, MeV-scale, neutrinos. The presence of a sharp time structure during a first emission phase, the so-called neutronization burst in the electron neutrino flavor time distribution, makes this channel a very powerful one. Large liquid argon underground detectors, like the future Deep Underground Neutrino Experiment...
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Ms Wenzer Qin (MIT)late universe (including CMB, dark energy, astrostatistics)
With the prospect of detecting the cosmological 21 cm signal from the epoch of reionization just over the horizon, methods for extracting maximal cosmological information from this signal are increasingly timely. I will discuss recent work to further develop the effective field theory (EFT) for the 21 cm brightness temperature field during the epoch of reionization, incorporating renormalized...
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Marco Matteini (Jožef Stefan Institute)early universe cosmology
We derive a closed-form false vacuum decay rate at one loop for a single real scalar field in the thin wall limit. We obtain the bounce solution, together with the Euclidean action, counter-terms and RG running, and we extract the functional determinant via the Gel’fand-Yaglom theorem. Our procedure is valid for a generic spacetime dimension $D$, and we provide an explicit finite renormalized...
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Julia Gehrleinearly universe cosmology
The formation of ultra rare supermassive black holes (SMBHs), with masses of $\mathcal{O}(10^9\,M_\odot)$, in the first billion years of the Universe remains an open question in astrophysics. At the same time, ultralight dark matter (DM) with mass in the vicinity of $\mathcal{O}(10^{-20}~\text{eV})$ has been motivated by small scale DM distributions. Though this type of DM is constrained by...
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Matteo Braglia (IFT UAM-CSIC)gravitational waves
Early Universe dynamics beyond the standard single-field slow-roll paradigm may produce a Stochastic Gravitational Wave Background (SGWB) in the LISA band. In this talk, we will present recent advances from the LISA CosWP in creating a 'bank' of templates representing the SGWB produced in popular inflationary models. We adopt a recently developed data analysis pipeline to forecast the...
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Dr Yi-Peng Wu (Laboratoire de Physique Théorique et Hautes Énergies (LPTHE))dark matter
If primordial black holes (PBHs) contribute more than 10 percent of the dark matter (DM) density, their energy density today is of the same order as that of the baryons. Such a cosmic coincidence might hint at a mutual origin for the formation scenario of PBHs and the baryon asymmetry of the Universe. Baryogenesis can be triggered by a sharp transition of the rolling rate of inflaton with a...
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David Benisty (Cambridge University)late universe (including CMB, dark energy, astrostatistics)
We investigate scalar-tensor theories, motivated by dark energy models, in the strong gravity regime around the black hole at the center of our galaxy. In such theories general relativity is modified since the scalar field couples to matter. We consider the most general conformal and disformal couplings of the scalar field to matter to study the orbital behavior of the nearby stars around the...
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Henrique Rubiragravitational waves
We study the effect of density perturbations on the process of first-order phase transitions and gravitational wave production in the early Universe. We are mainly interested in how the distribution of nucleated bubbles is affected by fluctuations in the local
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temperature.
We find that large-scale density fluctuations ($H_* < k_* < \beta$) result in a larger effective bubble size at the time... -
Matteo Luccalate universe (including CMB, dark energy, astrostatistics)
Observations of the Lyman-α flux, in overall good agreement with ΛCDM, have long been known to be able to place stringent bounds on models predicting significant small-scale suppressions of the matter power spectrum. Nevertheless, an apparent inconsistency in the determination of the spectrum's tilt at Lyman-α scales has raised the question of whether an overall better fit to the data than...
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Lucas Pinolearly universe cosmology
Inflationary scenarios motivated by high-energy physics generically contain a plethora of degrees of freedom beyond the primordial curvature perturbation. The latter interacts in a simple way with what we name inflationary flavor eigenstates, which differ in general from freely propagating inflationary mass eigenstates. We show that the mixing between these misaligned states results in a new...
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Mr Maciej Kierklagravitational waves
In our work we study the cosmological phase transition (PT) in a conformal extension of the Standard Model (SM). The model considered is called SU(2)cSM, it extends the SM gauge group by an additional hidden SU(2)$_X$ gauge group, and a scalar doublet (whilist singlet under SM gauge group). The tree-level potential has no mass terms, all the masses are generated via the Coleman-Weinberg...
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Mr Yannis Georis (UCLouvain)early universe cosmology
We for the first time map the range of active-sterile neutrino mixing angles in which leptogenesis is possible in the type I seesaw model with three heavy neutrinos with Majorana masses between 50 MeV and 70 TeV, covering the entire experimentally accessible mass range. Our study includes both, the asymmetry generation during freeze-in (ARS mechanism) and freeze-out (resonant leptotenesis) of...
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Anastasia Sokolenko (University of Chicago)dark matter
Axion-photon conversion is a prime mechanism to detect axion-like particles that share a coupling to the photon. We point out that in the vicinity of neutron stars with strong magnetic fields, magnetars, the effective photon mass receives comparable but opposite contributions from free electrons and the radiation field. This leads to an energy-dependent resonance condition for conversion that...
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Ian Padilla-Gay (University of Copenhagen - Niels Bohr Institute)particle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
In dense astrophysical environments, the neutrino and antineutrino densities are so extreme that neutrino-neutrino coherent forward scattering leads to collective neutrino oscillations, perhaps affecting the core-collapse mechanism and the nucleosynthesis of elements heavier than iron in compact binary remnants. Due to the profound potential implications for the source’s physics, the so-called...
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Carlos Blancodark matter
As the age of WIMP-scale dark matter (DM) draws to a close thanks to the ever-increasing sensitivity of direct detection experiments, the majority of DM parameter space outside of the weak scale remains to be explored. Sub-GeV DM can excite electronic transitions in a variety of molecular and nano-scale systems which have sub-eV scale thresholds. In particular, organic molecules,...
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Eloy de Jong (King's College London)early universe cosmology
I will talk about studying the formation of black holes from subhorizon and superhorizon perturbations in a matter dominated universe with 3+1D numerical relativity simulations. We find that there are two primary mechanisms of formation depending on the initial perturbation's mass and geometry -- via direct collapse of the initial overdensity and via post-collapse accretion of the ambient dark...
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Dr Silvia Manconi (Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen)dark matter
Dark Matter in our Galaxy may produce a linearly polarized synchrotron signal through the secondary emission of electrons and positrons originating from dark matter annihilations. Using the latest Planck data release, for the first time we use microwave synchrotron polarization to constrain Dark Matter annihilation in the Galaxy. We find that polarization is more constraining than...
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Nicklas Ramberg (Johannes gutenberg universität Mainz)dark matter
When the spontaneous breaking of the Peccei-Quinn (PQ) symmetry occurred, the
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resulting angular direction of the PQ field, i.e. the axion could have possessed an initial nonzero velocity arising from additional terms that explicitly break the PQ symmetry. This opens
up the possibility for smaller values of the decay constant than in the conventional scenario.
We elaborate further on the... -
Sveva Castellolate universe (including CMB, dark energy, astrostatistics)
The distribution of galaxies provides an ideal laboratory to test deviations from General Relativity. In particular, redshift-space distortions are commonly used to constrain modifications to the Poisson equation, relating the spatial component of the gravitational field with the matter density. However, such constraints rely on the validity of the weak equivalence principle, which has never...
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Xiao Xue (II. Institute of Theoretical Physics, Universitat Hamburg)particle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
The hitherto unprecedented angular resolution of the Event Horizon Telescope (EHT) has created exciting opportunities in the search for new physics. Recently, the linear polarization of radiation emitted near the supermassive black hole M87* was measured on four separate days, precisely enabling tests of the existence of a dense axion cloud produced by a spinning black hole. The presence of an...
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Mahmoud Al-Awashraparticle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
We study the effect of a tangled sub-fG level intergalactic magnetic field (IGMF) on the electrostatic instability of a blazar-induced pair beam. Sufficiently strong IGMF may significantly deflect the TeV pair beams, which would reduce the flux of secondary cascade emission below the observational limits. A similar flux reduction may result from the electrostatic beam-plasma instability, which...
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Jose Luis Bernal Meradark matter
Recent studies using New Horizons LORRI images have returned the most precise measurement of
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the cosmic optical background to date, yielding a flux that exceeds that expected from deep galaxy
counts by roughly a factor of two. We investigate whether this excess, detected at ∼ 4σ significance,
is due to dark matter that decays to a monoenergetic photon with a rest-frame energy in the... -
Ottavio Fornieri (GSSI)particle astrophysics (including cosmic rays, neutrinos, nuclear astrophysics)
We discuss the micro-physics of cosmic-ray (CR) diffusion as resulting from particle scattering onto the three modes in which the Magneto-Hydro-Dynamics (MHD) cascades are decomposed. Assuming that Alfvén modes are subdominant in confining CRs, due to their anisotropic cascading, we debate over the key points that need to be understood while considering fast-magnetosonic modes as the main...
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Noam Levi (Tel Aviv University)gravitational waves
We study supercooled first order phase transitions which are typical of theories where conformal symmetry is (mainly) spontaneously broken. In these setups the fate of the flat direction parametrically depends on the explicit breaking of conformal symmetry. This need to be in a particular region to realize a supercooled first order phase transition. We identify the ``supercooling window'' in...
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Juan Urrutiagravitational waves
As the number of event that gravitational wave detector detect increases the probability of finding lensed events gets bigger, with estimations of 0(100)/year for 3G detectors. The number and nature of this events is going to be a powerful prove on dark matter substructures. We will show recent developments on lensing by primordial black holes, dark stars and dark matter halos and how they...
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