Présidents de session
Astroparticle
- Daniel Kerszberg (LPNHE, CNRS/IN2P3)
Astroparticle
- Daniel Kerszberg (LPNHE, CNRS/IN2P3)
Astroparticle
- Daniel Kerszberg (LPNHE, CNRS/IN2P3)
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Daniel Kerszberg (LPNHE, CNRS/IN2P3)24/11/2026 09:00
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Lukas Arda (APC Paris)24/11/2026 09:30Astroparticle
The massive black hole at the centre of the Milky Way (MW), Sgr A*, has a precisely known sky position and is only $\sim 8$ kpc away. This makes it a unique source of extreme-mass-ratio gravitational-wave (GW) signals that would be too faint to detect from extragalactic sources. We study the full range of such events, from extreme-mass-ratio inspirals (EMRIs) and bursts to direct plunges,...
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David Fernando Freitas da Silva Cavalcante (APC (Université Paris Cité))24/11/2026 09:55Astroparticle
Dark matter (DM) particle interactions with detector targets are expected to be extremely rare, posing a major challenge for direct detection experiments. To maximize their sensitivity to potential DM signals, these experiments require highly efficient background rejection. This is typically accomplished through a combination of passive and active veto systems and offline techniques...
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Justin Albinet24/11/2026 10:50Astroparticle
Seyfert galaxies are a subclass of active galactic nuclei (AGN). They have emerged in recent years as potential cosmic-ray accelerators. In 2022, the IceCube collaborations revealed a very-high-energy neutrino excess coming from several Seyfert galaxies. Close-by sources like NGC 1068 and NGC 4151 present especially bright neutrinos hotspots and are thus very promising objects to better...
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titouan girault (IRFU, CEA Paris-Saclay, Université Paris-Saclay)24/11/2026 11:15Astroparticle
Dwarf galaxies are considered to be dark-matter-dominated systems, as indicated by multiple lines of evidence, most notably the analysis of their kinematics. This large dark matter content, combined with the absence of strong astrophysical emission, makes them prime targets in the search for gamma rays from the annihilation or decay of WIMP dark matter, and thus for testing and constraining...
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Manuel Pronesti (CPPM, Aix-Marseille Université, CNRS/IN2P3)24/11/2026 11:40Astroparticle
The existence of dark matter is firmly established by astrophysical and cosmological observations, yet its particle nature remains one of the most compelling open questions in physics. Among the proposed candidates, Weakly Interacting Massive Particles (WIMPs) are particularly well motivated by the so-called “WIMP miracle”: a weakly interacting, stable particle with electroweak-scale mass...
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Pierre Geneste (CEA-IRFU-DPhP)24/11/2026 12:05Astroparticle
Variability in gamma-ray emission provides a powerful probe of accretion and jet dynamics in active galactic nuclei. In the context of my PhD research on variability at very high energies, I investigate periodic and quasi-periodic signals as potential signatures of supermassive black hole binaries (SMBHBs). Identifying period changes would help identifying candidates to future SMBH mergers....
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Ugo LAINÉ (Subatech-KM3NeT), Ugo Lainé (Subatech-KM3NeT)24/11/2026 14:00Astroparticle
The KM3NeT experiment is a next-generation neutrino telescope and particle physics detector located in the depths of the Mediterranean Sea, aiming at detecting neutrino interactions through Cherenkov light produced by the resulting leading lepton in different energy ranges. Its detectors provide opportunities to investigate potential neutrino emission from astrophysical sources and improve our...
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Mulan Ahmed (IJCLap)24/11/2026 14:25Astroparticle
The Pierre Auger Observatory, covering an area of $3000~\mathrm{km}^2$ in Argentina, is the world's largest cosmic-ray observatory. It studies ultra-high-energy cosmic rays, charged particles originating from outer space that can reach energies exceeding $10^{20}~$eV, far beyond those achievable by human-made particle accelerators. The astrophysical sources capable of accelerating particles to...
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Lina BRETON--ZAOURAT (LAPP-CNRS)24/11/2026 14:50Astroparticle
Understanding quantum gravity remains one of the most challenging frontiers in modern physics. Thanks to new generations of Imaging Atmospheric Cherenkov Telescopes (IACTs) such as CTAO, we can now explore increasingly higher energies, accessing experimental observables that directly arise from quantum gravity theories. Lorentz Invariance Violation (LIV) is one such observable, and it can be...
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