GDR CoPhy Episode 4

Session

Monday afternoon

1 juin 2026, 16:30

Clermont Ferrand

54. Rubin-LSST : status and plans

M. Thibault Guillemin (LAPP)

01/06/2026 16:30

I will review where the Rubin project stands one year after the first on-sky images, describing the observatory performances and some highlights of the passed year.
I will also discuss the future plans, focusing particularly on the content of the Data Preview 2, a Science Validation dataset planned to be released this Summer.

56. The cosmic matter dipole problem

Albert Bonnefous-Abiven (Institut d'Astrophysique de Paris)

01/06/2026 17:00

The Ellis and Baldwin formula provides a model-independant way to measure our own velocity with respect to matter at large scale, by measuring the kinematic impact on the dipole in the number count of far away light sources. However, this measurement doesn't coincide with the same measurement of our velocity with respect to the CMB. This discrepancy puts into question the existence of the...

48. An inhomogeneous cosmological model: the axially symmetric Szekeres GR solution

Marie-Noëlle Celerier (Observatoire de Paris)

01/06/2026 17:30

Due to the current precision reached by the cosmological surveys, the standard $\Lambda$CDM model, despite its successes, has become an insufficient average to describe our actual Universe. Given the tensions arising between theory and observations, it appears that a more precise representation of the local universe is mandatory. Since General Relativity (GR) is the best theory currently...

37. WG ADE

Alain Blanchard

01/06/2026 18:00