Journées de Rencontre des Jeunes Chercheurs 2020 - CANCELED

Session

Theme 4

30 nov. 2020, 14:30

Village La Fayette - La Rochelle

152. Introduction Astroparticule / Cosmologie

Romain Gaior (LPNHE)

30/11/2020 14:30

104. The Search for Light Dark Matter with DAMIC

Ariel Matalon (University of Chicago; LPNHE)

30/11/2020 15:00

The DAMIC (Dark Matter in CCDs) experiment employs the bulk silicon of scientific-grade charge coupled devices (CCDs) to detect dark matter particles. Since 2017, DAMIC has operated a seven-CCD detector (40-gram target mass) installed in a low radiation environment in the SNOLAB underground laboratory. The CCDs have excellent energy and spatial resolutions, low-energy threshold and unique...

124. Development and characterization of novel electronics for the search of dark matter for DAMIC-M

Georgios PAPADOPOULOS (LPNHE)

30/11/2020 15:30

Despite plenty of evidence for the existence of Dark Matter (DM), no experiment has ever managed to capture it directly. In the last decades, the Weakly Interacting Massive Particle (WIMP) paradigm, the most popular among the DM models, has proven unsuccessful experimentally in a variety of detection methods in the GeV-TeV mass range. DAMIC-M (DArk Matter In CCDs at Modane) will aim to...

117. Reducing coating thermal noises in Gravitational wave detectors using AlGaAs crystalline mirrors

Victor Hui (LAPP)

30/11/2020 16:30

The first gravitational wave detections occured with the LIGO detector in the United states and the Virgo detector in Europe, opening the way to the field of gravitational astronomy and providing informations on black holes, neuton stars and relativity theory of Einstein that were inaccessible before. These detectors are based on giant laser interferometers several kilometers long. It is...

105. Optimisation of the optical follow up of gravitationnal waves events

Jean-Grégoire Ducoin (LAL - Virgo)

30/11/2020 17:00

The third LIGO-Virgo run (O3) started the first of April and multi-messenger astronomy related to gravitational waves with it. Gravitational waves from binary neutron star (BNS) coalescence, in association to short gamma-ray burst, opened a new era of multi-messenger astronomy. The identification of the counterpart and it’s multi-wavelength observations improved our understanding of the...

134. The hunt for VHE gamma-rays in the Gravitational Waves era.

Halim Ashkar (CEA-Irfu)

30/11/2020 17:30

In multi-messenger astrophysics, we combine different astronomical messengers in order to study different aspects of an object or a process in the Universe. Nowadays, four astronomical messengers exist: electromagnetic waves, cosmic rays, neutrinos and Gravitational Waves (GW). The first direct discovery of GW emitted from the inward spiral of two black holes in 2015 took multi-messenger...

102. Development of an advanced Compton telescope prototype for MeV-range gamma-ray astronomy

M. Adrien LAVIRON (CSNSM, Université Paris-Sud/CNRS IN2P3)

30/11/2020 20:30

An advanced Compton telescope appears to be the best instrument concept for the next generation gamma-ray space observatory in the MeV range. A first prototype of advanced Compton telescope is being developed to match the constraints of a nano-satellite mission, with the scientific objective of measuring gamma-ray burst prompt emission polarization. Instrumental developments at CSNSM for this...

160. StarTrack predictions of the stochastic gravitationnal-wave background from compact binary coalescences

Carole Perigois

30/11/2020 21:00

In this study we evaluate the contribution of binary coalescences to the stochastic gravitationnal-wave background from population 1, 2 and 3, as defined by to the hertzsprung Russel classification. We assume that the coalescences we observed are formed throug stellar evolution in the field of galaxies with no dynamical interactions. We use the new population synthesis starTrack to generate...

115. Using simulated quasar catalogs for the BAO in lyman-$\alpha$ analysis of eBOSS and DESI

Julianna Stermer (LPNHE)

30/11/2020 21:30

The accelerated expansion of the universe caused by the presence of dark energy was first observed in 1998 by measurement of the luminosity of type Ia supernovae. In 2005, a new probe for dark energy, the Baryon Acoustic Oscillation (BAO) was introduced. This probe is based on the imprint left in the matter density field by sound waves propagating in the primordial universe. Following the...

125. Parametric Instabilities study of the ground-based interferometer gravitational waves detector Virgo

David Cohen (LAL, Univ. Paris Sud, CNRS/IN2P3, Université Paris Saclay)

Now that the global LIGO-Virgo network has successfully detected gravitational waves from compact binary coalescences, a key challenge is to improve the detector sensitivity in order to detect more transient sources — weaker or located further away. The detectors' sensitivity can be enhanced by increasing the laser power travelling within the arm cavities, for it reduces the effect of the...