Présidents de session
Astroparticle / Cosmology
- Federica BRADASCIO (IJCLab, Université Paris-Saclay)
Astroparticle / Cosmology
- Federica BRADASCIO (IJCLab, Université Paris-Saclay)
Astroparticle / Cosmology
- Federica BRADASCIO (IJCLab, Université Paris-Saclay)
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Federica BRADASCIO (IJCLab, Université Paris-Saclay)02/12/2025 09:20
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Chloé Barjou-Delayre02/12/2025 09:50Cosmology
The cosmological principle assumes the isotropy of the Universe. The high coverage of the Zwicky Transient Facility survey (ZTF) makes it possible to carry out an unprecedented study of the veracity of this principle by using observation of type Ia supernovae (SNe Ia).
This unique low redshift (z<0.15) survey with more than 3000 SNe Ia in the second data release (ZTF-DR2-SNe Ia) increases...
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Pierre Pichard (APC)02/12/2025 10:45Astroparticle
Développée dans les années 1980, l’astronomie à très haute énergie (THE) a connu un bond lors des deux dernières décennies grâce à l’arrivée de la génération actuelle de télescopes tcherenkov à imagerie atmosphérique (IACTs). Le réseau de télescopes H.E.S.S. (High Energy Stereoscopic System), installé en Namibie, a grandement contribué à cet essor.
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Parmi les nombreux phénomènes... -
Julian Hamo (IJCLab)02/12/2025 11:10Astroparticle
Both the Rubin Observatory and the first telescopes of the CTAO will be collecting data by 2026, marking a new era in optical and gamma-ray astronomy. Compared to predecessors like the ZTF, H.E.S.S., MAGIC, and VERITAS, their enhanced sensitivity will extend extragalactic observations to a redshift of at least $\sim$2.5. This advancement offers fresh insights into non-thermal astrophysical...
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Janna Machts02/12/2025 11:35Astroparticle
The DarkSide20k experiment is a direct Dark Matter detector focused on the search for WIMP dark matter. Its main component is a dual-phase Argon Time Projection Chamber (TPC). Here, particles are detected from collisions with Argon atoms and the subsequent emission of scintillation light as well as ionisation electrons. Since the rate of signal events is expected to be much lower than...
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Anastasiia Mikhno02/12/2025 12:00Astroparticle
The Cherenkov Telescope Array Observatory (CTAO) is going to consist of more than 60 telescopes in the northern and southern hemispheres, being the largest and most sensitive instrument to gamma rays from 20 GeV to 300 TeV. The arrays will be made of four Large-Sized Telescopes (LSTs) in the Northern Hemisphere, up to 23 Medium-Sized Telescopes (MSTs) distributed over both array sites for its...
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Bernardo Cornejo (CEA - Irfu)02/12/2025 13:55Astroparticle
Multi-wavelength and multi-messenger astrophysics have experienced remarkable growth over the past decade, aiming to build a comprehensive picture of various cosmic phenomena. Transient sources, in particular, greatly benefit from the complementary information provided by multi-messenger observations, both enhancing follow-up of rapidly fading signals and allowing for a better physical...
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Gaspard Joubert02/12/2025 14:20Astroparticle
The first direct observation of gravitational waves (GW) in 2015 by the LIGO/Virgo/Kagra (LVK) collaboration opened a new era of astronomy. The GW group at IP2I in Lyon contributes to both the analysis of interferometers data and the characterization of the VIRGO detector. Most gravitational-wave online search pipelines rely on matched filtering (MF), a method which compares the data to a...
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Nathan Lebas02/12/2025 14:45Astroparticle
The Giant Radio Array for Neutrino Detection (GRAND) is a project aiming at the detection of ultra-high-energy (UHE) cosmic rays, gamma rays and neutrinos through the radio emission produced by extensive air showers in the atmosphere. It consists of a network of autonomous radio antennas deployed over large areas in radio-quiet, mountainous regions, using the surrounding topography as a target...
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Manuel Pronesti (CPPM, Aix-Marseille Université, CNRS/IN2P3)Astroparticle
The nature of dark matter, whose existence is firmly established by astrophysical and cosmological observations, remains one of the most compelling open questions in physics. Among the proposed candidates, Weakly Interacting Massive Particles (WIMPs) are one of the most promising models. They are theoretically motivated by the so-called “WIMP miracle”: a weakly interacting, stable particle...
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