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SUMMARY:The FLAMINGO project: revisiting the S8 tension and the role of ba
 ryonic physics - Ian McCarthy (Liverpool John Moores University)
DTSTART:20240325T130000Z
DTEND:20240325T140000Z
UID:TALK209653@talks.cam.ac.uk
CONTACT:Fiona McCarthy
DESCRIPTION:A number of recent studies have found evidence for a tension b
 etween observations of large-scale structure (LSS) and the predictions of 
 the standard model of cosmology with the cosmological parameters fit to th
 e cosmic microwave background (CMB). The origin of this 'S8 tension' remai
 ns unclear\, but possibilities include new physics beyond the standard mod
 el\, unaccounted for systematic errors in the observational measurements a
 nd/or uncertainties in the role that baryons play. In this talk\, I will e
 xamine the latter possibility using the new FLAMINGO suite of large-volume
  cosmological hydrodynamical simulations.  I will discuss how important 'f
 eedback' processes that affect the baryons are implemented and calibrated 
 in the simulations and how the simulations are projected onto observable s
 pace for comparisons with observational measurements of cosmic shear\, CMB
  lensing\, and the thermal Sunyaev-Zel'dovich (tSZ) effect.  I will then f
 ocus on the dependence of the predictions on the efficiency and nature of 
 baryonic feedback and whether or not it can plausibly resolve the S8 tensi
 on.  Finally\, I will discuss some independent tests that the simulations 
 can be subjected to in order to build confidence (or undermine it!) in our
  cosmological conclusions.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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