GDR CoPhy Episode 4

Session

Wednesday Morning

3 juin 2026, 10:45

Clermont Ferrand

35. Multi-probe inferences of late-time cosmic dynamics from Stage-III to Stage-V surveys

Eleni Tsaprazi (Imperial College London)

03/06/2026 10:45

Dark matter and dark energy dominate the late-time Universe, but their physical nature remains unknown. I will present results on using the clustering of cosmological tracers (supernovae, galaxies, galaxy clusters) to constrain late-time cosmic dynamics from Stage-III to Stage-V surveys within a Bayesian forward-modelling framework. I will summarise key results from existing data sets,...

61. Overview of DESI and its recent results

Domitille Chebat (CEA Saclay - IRFU - DPhP)

03/06/2026 11:15

The Dark Energy Spectroscopic Instrument (DESI) published its DR2 Baryon Acoustic Oscillation (BAO) measurement in March 2025, based on a spectroscopic sample of over 14 million galaxies and quasars. After an overview of the DESI survey itself, I will present the DR2 BAO measurement and its cosmological implications, with a particular focus on neutrino mass constraints and on the nature of...

63. Simulation-Based Inference (SBI) for cosmology with type Ia Supernovae (SNe Ia).

Adam TRIGUI (IP2I)

03/06/2026 11:45

Systematic uncertainties associated to calibration, selection functions and astrophysical effects are dominating the error budget of SNe Ia cosmology. Correction methods applied to account for these systematics, and especially for the complex combination of selection functions and astrophysical variability, are questionable, particularly given the current H0 and Λ tensions for which SN Ia data...