Colloque national du WG Dark Energy 2025 - 9ème édition

$f\sigma_8$ measurement with the type Ia Supernovae from the Zwicky Transient Facility DR2.5

Nov 5, 2025, 2:50 PM

20m

Amphithéâtre de physique, bâtiment 20 (Université de Montpellier)

Speaker

Rafael Kebadian (CPPM)

Description

$f\sigma_8$ is a powerful probe at low redshift to discriminate between different theories of gravity. In linear theory, this parameter is directly related to the velocity field. In this talk, I will show how the peculiar velocities of ZTF Type Ia supernovae can be used to measure $f\sigma_8$. I apply a maximum likelihood approach together with realistic simulations based on N-body mocks. I also investigate systematic effects in preparation for the analysis of the ZTF Data Release 2.5.

Presentation materials

20251031_ade_fs8_ztf.pdf