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SUMMARY:New Results from the Abundance of SPT Clusters with DES and HST We
 ak Lensing - Sebastian Bocquet (LMU Munich)
DTSTART:20231120T130000Z
DTEND:20231120T140000Z
UID:TALK204640@talks.cam.ac.uk
CONTACT:Inigo Zubeldia
DESCRIPTION:The abundance of massive halos (and of the galaxy clusters the
 y host) has long been recognized as an extremely promising probe of the la
 rge-scale structure of the universe. Over the past decade\, tremendous pro
 gress was made\, notably thanks to the availability of high-resolution sur
 veys of the Cosmic Microwave Background (CMB)\, of high-quality measuremen
 ts of gravitational lensing\, and of advanced numerical simulations.\nThe 
 sample of galaxy clusters selected by the South Pole Telescope (SPT) in th
 e CMB now exceeds a thousand objects. The Dark Energy Survey (DES) allows 
 for measurements of gravitational lensing for almost 700 sample clusters w
 ith exquisit control over systematic uncertainties. We supplement this dat
 aset with 39 lensing measurements of high-redshift clusters with the Hubbl
 e Space Telescope (HST). The joint analysis of the cluster abundance and w
 eak-lensing mass calibration provides tight cosmological constraints that 
 are competitive with other major probes.\nIn my talk\, I will review the S
 PT cluster cosmology and mass calibration program. I will focus on the lat
 est SPT + DES Y3 + HST analysis and present new cosmological constraints.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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