Journées de Rencontre Jeunes Chercheur·se·s 2026

Session

Cosmology

25 nov. 2026, 11:35

Présidents de session

Cosmology

• Anna Niemiec (LPSC)

Cosmology

• Anna Niemiec (LPSC)

Cosmology

• Anna Niemiec (LPSC)

77. Session Overview

Anna Niemiec (LPSC)

25/11/2026 11:35

97. 3x2pt Cosmology with Euclid

Urwa Shoaib

25/11/2026 12:05

Cosmology

Galaxy clustering allows the study of galaxy distribution across the Universe, revealing critical insights into the structure of the Universe, its dynamics and the nature of dark energy. On the other hand, weak lensing enables the inference of dark matter distribution by analyzing the deformation of background galaxies by foreground masses.

The 3x2pt method, which combines galaxy...

127. High angular resolution Sunyaev-Zel’dovich effect observations of galaxy cluster

Victor Chalamet (LPSC)

26/11/2026 09:00

Cosmology

Galaxy cluster are the most massive gravitationally bound structures in the Universe, thus, they are of great cosmological interest. Indeed, their mass and redshift distribution can be used to constrain cosmological parameters.
In order to study clusters we can use the thermal Sunyaev-Zel'dovich (tSZ) effect that is produced by the inverse Compton interaction of CMB photons with the hot gas...

169. Gravitational Lensing Beyond Standard Approximations

M. Laurent MAGRI-STELLA (LAPP)

26/11/2026 09:25

Cosmology

Are the standard approximations used in gravitational lensing still adequate in the era of precision cosmology? If not, how can we move beyond them?

As cosmological tensions sharpen, a new generation of surveys such as Euclid and LSST is set to deliver an unprecedented volume of data, with billions of galaxies analyzed through increasingly sophisticated pipelines, including machine-learning...

145. Stellar streams and photometric distances with the first data from the Vera C. Rubin Observatory.

Théotime Hallouin (LPCA/CNRS)

26/11/2026 09:50

Cosmology

The existence of dark matter has been established through its gravitational influence on visible matter and light. Although it constitutes a major component of our Universe, its nature remains mysterious, with several conflicting models being plausible. While the power spectrum of matter on cosmological scales is well-constrained beyond the galactic scale, most observational methods struggle...

124. Measuring the Expansion of the Universe with Gravitational Waves

Maxime Bloch (Subatech (UMR 6457))

26/11/2026 10:45

Cosmology

Gravitational waves were predicted in 1916 by Albert Einstein through his theory of general relativity. A century later, on 14 September 2015, the first signal was detected by the LIGO-Virgo Collaboration through interferometric measurements of spacetime distortions produced by the coalescence of two compact objects$^{[1]}$.

This new observational window on the Universe has opened the door...

131. Talk Cosmo #5

Eva Elkhoury (Qubic), Eva Elkhoury (APC)

26/11/2026 11:10