GDR CoPhy Episode 4

Session

Monday afternoon

1 juin 2026, 14:00

Clermont Ferrand

60. welcome

Prof. Jean Orloff

01/06/2026 14:00

55. Introduction to the GDR COPHY episode 4

Johann COHEN-TANUGI (LPCA, Université Clermont-Auvergne & CNRS)

01/06/2026 14:10

36. GDR COPHY Status report

Josquin Errard

01/06/2026 14:20

38. WG TUG

Vivian POULIN (LUPM, CNRS & U. de Montpellier, France)

01/06/2026 14:30

47. Cosmology with strong lensing images

Julien Larena (LUPM, Université de Montpellier)

01/06/2026 14:50

Massive galaxies, acting as gravitational lenses, can form greatly distorted images of background galaxies in so called strong lensing events. When background galaxy and lens are almost aligned along the line of sight, the image take the shape of an Einstein ring whose shape encodes basic properties of the lens.
However, since lenses are not isolated objects in an otherwise perfectly...

69. Gravitational lensing beyond approximations: relativistic lightcones for modern cosmological surveys

Laurent MAGRI--STELLA (LAPP)

01/06/2026 15:20

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...

71. Cosmology within the GdR Gravitational waves

Dr Michele Mancarella (Centre de Physique Théorique (CPT))

01/06/2026 15:50

(online talk)