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SUMMARY:How much (robust) cosmological information can we obtain from gala
 xy clustering? - Fabian Schmidt (MPA\, Garching)
DTSTART:20240212T130000Z
DTEND:20240212T140000Z
UID:TALK210091@talks.cam.ac.uk
CONTACT:Dr  Dong-Gang Wang
DESCRIPTION:All large-scale structure cosmologists are faced with the ques
 tion: how do we robustly extract cosmological information\, such as on dar
 k energy\, gravity\, and inflation\, from observed tracers such as galaxie
 s whose astrophysics is extremely complex and incompletely understood? I w
 ill describe why guaranteeing this robustness is so difficult\, and how a 
 perturbative effective-field-theory (EFT) approach offers such a guarantee
  when focusing on galaxy clustering on large scales. The natural next ques
 tion then is: how much cosmological information is left on these large sca
 les if we marginalize over all the free parameters introduced in the EFT? 
 To answer this question\, I will introduce our implementation of the EFT o
 n a lattice as an explicit field-level forward model\, which can be used b
 oth for full Bayesian inference at the field level and for likelihood-free
  (simulation-based) inference using summary statistics. Finally\, I will s
 how first results comparing full field-level inference and summary statist
 ics on fully nonlinear mock tracers.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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