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Dr Yann Gouttenoire (Tel Aviv University)11/03/2026 14:10
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Dr Elsa Teixeira (LUPM Montpellier)11/03/2026 14:50
The persistent discrepancies between predictions of the standard cosmological model and high-precision measurements across multiple probes remain a significant challenge in modern cosmology. Over the past decade, mounting evidence for tensions in key cosmological parameters - derived through both model-dependent and independent methods - has motivated the exploration of extensions to the...
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Anna CHRYSOSTOMOU (LPTHE)11/03/2026 15:10
We show that first-order phase transitions generically arise during the breaking of TeV-scale SU(2) flavour gauge symmetries and can generate gravitational-wave signals observable by next-generation detectors. These transitions occur only for order-one flavour gauge couplings: beyond $g_f \sim 1.0-1.5$, one-loop corrections to the quartic interaction dominate the thermal potential and weaken...
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Sonali VERMA (Universite Libre de Bruxelles)11/03/2026 15:30
In this talk [based on 2602.10078], I will show how measurements of the intergalactic medium (IGM) temperature from the Lyman-α forest can be used to constrain long-lived dark sector particles with lifetimes larger than 10¹⁶ s. Such particles deposit energy into the IGM through decays to Standard Model states, thereby modifying its late-time thermal history. I will also revisit constraints on...
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Paolo Bilisco (IPhT - Université Paris-Saclay)11/03/2026 15:50
LIGO, VIRGO and Kagra (just to name a few) represent outstanding feats of engineering that have launched us in a new era of gravitational-wave (GW) detection. Even so, we may wonder whether their sensitivity is enough to detect very high-frequency signals of beyond-Standard-Model origin, such as those sourced by primordial stochastic GW backgrounds, primordial black holes, or black hole...
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Salvador ROSAURO-ALCARAZ (LPCA-CNRS)11/03/2026 16:40
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32. Primordial lepton asymmetries: new constraints and consequences for sterile neutrino dark matterM. Julien Froustey (Institut d'Astrophysique de Paris (IAP))11/03/2026 17:20
Resonant production via active–sterile neutrino oscillations in the presence of large lepton asymmetries (the Shi–Fuller mechanism) remains a compelling scenario for keV-scale sterile neutrino dark matter. For a long time, the constraints on such asymmetries were obtained thanks to big bang nucleosynthesis and cosmic microwave background measurements, but did not properly account for the...
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Greg Jackson (SUBATECH (CNRS/IN2P3))11/03/2026 17:40
The dynamics of neutrinos and antineutrinos at MeV temperatures sets the Standard Model prediction for the effective number of relativistic species, N_{eff}, a key target for upcoming CMB and BBN measurements. Reaching a suitable theoretical accuracy demands control over sub-percent effects in the relevant interaction rates. In this talk I will review recent progress on precision calculations...
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Salvador URREA GONZALEZ11/03/2026 18:00
We provide a systematic survey of spallation sources around the world and their potential to search for new light particles. We study the sensitivity of existing neutrino detectors to the decay in flight of light particles produced in the decay at rest of pions, muons, and kaons. At J-PARC, we show that the magnetized gaseous argon detectors of ND280 could place leading limits on light...
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Luca Scotto Lavina (LPNHE Paris)12/03/2026 09:00
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Jordan Koechler (INFN Turin)12/03/2026 09:40
The particle nature of dark matter remains one of the most important open questions in physics. An intriguing clue is the γ-ray excess observed by Fermi-LAT toward the Galactic Center, whose spectrum resembles the expected signal from annihilating weakly interacting massive particles. However, many conventional dark matter models are now strongly constrained by direct detection and collider...
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Arpan Kar (LPTHE, Sorbonne University)12/03/2026 10:00
Indirect searches for Dark Matter (DM) particles with mass in the MeV - GeV scale have received significant attention lately. Pair-annihilations of such DM particles in the Galaxy can give rise to MeV - GeV gamma-rays via prompt emission, sub-GeV e+e-'s in cosmic-rays, as well as a broad photon spectrum ranging from X-rays to soft gamma-rays, produced by the secondary emissions from DM induced...
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Thomas REGGIO (LPCA)12/03/2026 10:20
The freeze-in mechanism is an alternative mechanism for dark matter production to standard thermal freeze-out. Freeze-in computations are typically performed assuming a very high initial ("reheating") temperature. However, this temperature is poorly constrained and can take relatively small values. I will discuss dark matter freeze-in in such a scenario and highlight how dark matter production...
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Hyungjin Kim12/03/2026 11:10
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Baraa Yahya (IPhT (CEA-SACLAY))12/03/2026 11:50
The piezoaxionic effect enables the conversion of axion-induced nuclear Schiff moments into measurable voltages in piezoelectric crystals. We propose a heterodyne implementation in which controlled nuclear spin dynamics are used to mix the axion oscillation frequency with the nuclear Larmor frequency. This produces sideband signals that allow frequency scanning through the applied magnetic field.
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Giacomo Ferrante12/03/2026 12:10
The magnetic monopole of a dark sector has been advocated as an appealing dark matter candidate, since its stability naturally follows from topological arguments. I will revisit the computation of the monopole abundance generated by a thermal phase transition, exploring the three regimes where the phase transition is second order, weakly first order, or supercooled. This will allow us to...
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Ana M. Teixeira (LPCA - Clermont), Bertrand Georgeot, Karim Benakli (CNRS), Laurent Vacavant (IN2P3), Sabine Kraml (CNRS - LPSC Grenoble), Prof. Yann MAMBRINI (CNRS, IJCLab, Université Paris-Saclay)12/03/2026 14:00
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Stefano De Angelis12/03/2026 16:00
I will begin with a broad overview of the modern literature on scattering amplitudes and the development of the contemporary on-shell approach to quantum field theory computations. I will then turn to the recent application of these methods to gravitational wave physics, highlighting current achievements, the state of the art, and the key conceptual and technical advances in recent years. I...
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Stam Nicolis (LMPT Tours)12/03/2026 16:40
The scalar sector of the Standard Model is the least constrained of the three parts. While supersymmetry has been used in order to impose constraints on it, it seems that these aren't stringent enough to lead to discovery of new effects on their own. In this contribution I'd like to recall the idea of Parisi and Sourlas from 1982 and show how it can lead to new constraints on the scalar sector.
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Shahram Vatani (CP3 UCLouvain)12/03/2026 17:00
Gauge-fermion theories and their IR fate remain puzzling mysteries in QFT, even after decades of study. Beyond their theoretical interest, they may play a natural role in extensions of the Standard Model, such as grand unified theories, dynamical symmetry breaking, and models of quark and lepton substructure. Yet our limited understanding of their nonperturbative dynamics severely hampers...
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Mattias sebastian SJO (CPT Marseille)12/03/2026 17:20
We compute hadronic vacuum polarization, an observable whose precision limits several important tests of the Standard Model, using two-flavor chiral perturbation theory to three loops (next-to-next-to-next-to-leading order). Particular attention is given to the loop integrals, several of which are not found in literature, and which display a novel set of relations beyond what is found through...
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Remy Larue, larue12/03/2026 17:40
I will show how the anomaly cancellation conditions can be straightforwardly obtained by bootstrapping the on-shell amplitude of the quantum anomalies. This will be applied to various gauge and gravitational anomalies.
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Nazila Mahmoudi (Lyon University)13/03/2026 09:10
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Dr En-Hung Chao13/03/2026 09:50
The decay of a long-lived kaon to a pair of muons (KL2mu) could serve as a precision test of the Standard Model (SM) and a probe to physics beyond due to its sensitivity to physics at high energies. A precise determination of the size of the long-distance, two-photon contribution to KL2mu -- as well as its interference with the analytically-computable short-distance (SD) contribution -- are...
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Gloria Montana (Universitat de Barcelona & ICCUB)13/03/2026 10:10
The spectrum of light hadrons encodes essential information about the non-perturbative dynamics of QCD. Most observed hadrons are resonances, rigorously defined as poles of scattering amplitudes in the complex energy plane. Their properties, such as masses, widths, and couplings, are therefore determined by the analytic structure of the amplitudes describing low-energy hadronic interactions....
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Luca Maxia (LPTHE - Sorbonne & CNRS)13/03/2026 10:30
Quarkonia are bound states formed by a heavy-quark pair. They are commonly described within the framework of non-relativistic QCD. Yet, this description is not sufficient to fully exploit data involving quarkonium production, which still hide precious information and call for theoretical improvements. In this talk, I will try to give a (biased) perspective on what quarkonium physics can teach...
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Anja Butter (LPNHE)13/03/2026 11:20
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Ben Assi (University of Cincinnati)13/03/2026 12:00
We begin by reviewing how NLL accuracy is achieved in modern parton showers—highlighting the recent Sherpa implementation—and then introduce our new information-theoretic matching framework to achieve beyond NLL accuracy. By minimizing a Kullback–Leibler functional under constraints set by precision QCD input observables (including theory uncertainties), we embed high-order predictions into...
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Kirill Boguslavski (SUBATECH)13/03/2026 14:00
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Omar Elgedawy (Ecole Polytechnique, CPHT)13/03/2026 14:40
Very high energy electrons passing through ordinary matter initiate electromagnetic showers that are produced by bremsstrahlung and pair production. At extremely high energies, the quantum-mechanical duration of these processes becomes longer than the mean free time for elastic scattering in the medium, which leads to a significant suppression of bremsstrahlung (and pair production). This...
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M. Loïc Fernandez (Laboratoire Charles Coulomb)13/03/2026 15:00
We will discuss the recent developments in renormalization group improvements of the cold and dense QCD pressure (Phys. Rev. D 111, 034020 and Phys. Rev. Lett. 129, 212001) at next-to-next-to leading order (NNLO) through the renormalization group optimized perturbation theory (RGOPT) and at all-order resummation of the soft modes. RGOPT applied for the very first time at NNLO displayed a...
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Andrea Palermo13/03/2026 15:20
The spin polarisation of Dirac fermions is an important observable in the Quark Gluon Plasma (QGP), as it allows connecting an entirely quantum property to the thermodynamic gradients at the freeze-out stage. For a correct description of experimental data, non-equilibrium effects play a crucial role, but they are harder to study and involve some theoretical ambiguities. I will present exact...
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Dr Redamy Perez Ramos
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