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SUMMARY:How much (robust) cosmological information can we obtain from gala
xy clustering?
DTSTART;VALUE=DATE-TIME:20231123T110000Z
DTEND;VALUE=DATE-TIME:20231123T123000Z
DTSTAMP;VALUE=DATE-TIME:20240229T183751Z
UID:indico-event-1793@indico.ifae.es
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 simulation-base
d inference based on summary statistics. One crucial advantage of this for
ward model is the non-perturbative treatment of the displacement from init
ial positions to observed coordinates\, with ramifications for BAO reconst
ruction and redshift-space distortions.\n\nhttps://indico.ifae.es/event/17
93/
LOCATION:Hybrid Seminar IFAE Seminar Room + Zoom
URL:https://indico.ifae.es/event/1793/
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