G. Chardin
A5048777551- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- High-Energy Particle Collisions Research
- Scientific Research and Discoveries
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Advanced Thermodynamics and Statistical Mechanics
- Relativity and Gravitational Theory
- Quantum Mechanics and Applications
- Nuclear Physics and Applications
- Computational Physics and Python Applications
- Physics of Superconductivity and Magnetism
- Noncommutative and Quantum Gravity Theories
- Astronomy and Astrophysical Research
- Particle accelerators and beam dynamics
- Galaxies: Formation, Evolution, Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
Laboratoire AstroParticule et Cosmologie
2021-2022
Université Paris Cité
2006-2021
Centre National de la Recherche Scientifique
2006-2020
Université de Strasbourg
2018-2020
Institut de Physique et Chimie des Matériaux de Strasbourg
2018-2020
Campus France
2010-2019
Institut d'Astrophysique de Paris
2010-2017
Institut National de Physique Nucléaire et de Physique des Particules
2004-2016
Université Paris-Sud
1990-2014
Université Paris-Saclay
2006-2014
The EDELWEISS-II Collaboration has completed a direct search for WIMP dark matter with an array of ten 400-g cryogenic germanium detectors in operation at the Laboratoire Souterrain de Modane. combined use thermal phonon sensors and charge collection electrodes interleaved geometry enables efficient rejection γ-induced radioactivity as well near-surface interactions. A total effective exposure 384 kg d been achieved, mostly coming from fourteen months continuous operation. Five nuclear...
The final results of the EDELWEISS-I dark matter search using cryogenic heat-and-ionization Ge detectors are presented. data sample corresponds to an increase by a factor 5 in exposure relative previously published results. A recoil energy threshold 13 keV or better was achieved with three 320 g working simultaneously over four months stable operation. Limits on spin-independent cross section for scattering weakly interacting massive particle nucleon derived from accumulated fiducial...
The CDMS and EDELWEISS collaborations have combined the results of their direct searches for dark matter using cryogenic germanium detectors. total data set represents 614 kg.d equivalent exposure. A straightforward method combination was chosen its simplicity before were exchanged between experiments. are interpreted in terms limits on spin-independent WIMP-nucleon cross-section. For a WIMP mass 90 GeV/c^2, where this analysis is most sensitive, cross-section 3.3 x 10^{-44} cm^2 excluded at...
The ΛCDM standard model, although an excellent parametrization of the present cosmological data, contains two as yet unobserved components, dark matter and energy, that constitute more than 95% Universe. Faced with this unsatisfactory situation, we study unconventional cosmology, Dirac-Milne universe, a matter-antimatter symmetric in which antimatter is supposed to negative active gravitational mass. main feature cosmology linear evolution scale factor time, directly solves age horizon...
The EDELWEISS-II Collaboration has performed a direct search for WIMP dark matter with an array of ten 400 g heat-and-ionization cryogenic detectors equipped interleaved electrodes the rejection near-surface events. Six months continuous operation at Laboratoire Souterrain de Modane have been achieved. observation one nuclear recoil candidate above 20 keV in effective exposure 144 kg d is interpreted terms limits on cross-section spin-independent interactions WIMPs and nucleons. A 1.0×10−7...
The present study is based on a sample of 407 775 single muons and 12 559 muon bundles with zenith angles smaller than 60°, observed in the 12.3m×6m×6m Fréjus proton-decay detector, at depth 4850 hg/cm2. variation vertical intensity given. Using maximum-likelihood method, lateral distribution underground investigated as function multiplicity angle. same method yields true site depth, corrected for all detection effects.Received 5 May 1989DOI:https://doi.org/10.1103/PhysRevD.40.2163©1989...
We construct a family of models with negative gravitational mass in the context Newtonian gravity. focus, particular, on model that reproduces features so-called Dirac-Milne universe, matter-antimatter symmetric universe was recently proposed as an alternative cosmological scenario [A. Benoit-L\'evy and G. Chardin, Astron. Astrophys. 537, A78 (2012)]. perform one-dimensional N-body simulations these negative-mass for expanding study associated formation structures. The similarities...