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SUMMARY:[IP2I seminar] Cosmology - C. Payerne (IRFU CEA\, Saclay\, FR) - C
 osmology with galaxy clusters in the Rubin LSST era
DTSTART:20260512T090000Z
DTEND:20260512T100000Z
DTSTAMP:20260517T184000Z
UID:indico-event-39543@indico.in2p3.fr
DESCRIPTION:Galaxy clusters are among the main cosmological tracers for pr
 obing the late-time universe\, offering unique insight into how cosmic str
 ucture grows and what drives it\, from dark matter to dark energy. With ne
 xt-generation photometric surveys like the Vera C. Rubin Observatory’s L
 SST and Euclid set to deliver hundreds of thousands of optically selected 
 clusters\, we are entering an era of unprecedented statistical power. The 
 current limiting factor of cluster number count cosmology is our knowledge
  of the cluster mass–proxy relation\, which connects galaxy clusters' ob
 servables to the underlying cosmology-dependent halo mass distribution. To
  address this challenge\, cluster number counts are usually combined with 
 weak gravitational lensing\, which probes the projected matter distributio
 n within clusters. In this talk\, I will present my contribution to the an
 alysis framework developed within the LSST Dark Energy Science Collaborati
 on (LSST DESC)\, and its application to the simulated LSST DESC DC2 datase
 t\, by combining cluster abundance with weak gravitational lensing mass es
 timates to infer the mass-proxy relation jointly with cosmological paramet
 ers. Moreover\, I will discuss the growing interest in simulation-based in
 ference (SBI) methods for cluster cosmology\, which enable forward modelin
 g of both cluster abundance measurements and lensing observables without r
 equiring explicit likelihood formulations\, paving the way for more robust
  cosmological analyses using galaxy clusters.\n\nhttps://indico.in2p3.fr/e
 vent/39543/
LOCATION:Dirac/RdC-Amphithéâtre (IP2I)
URL:https://indico.in2p3.fr/event/39543/
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