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SUMMARY:Galaxy power spectrum in general relativity  - Nastassia Grimm\, U
 niversity of Zurich
DTSTART:20201012T120000Z
DTEND:20201012T130000Z
UID:TALK150982@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:In this talk\, I present the impact of general relativistic ef
 fects on the galaxy power spectrum. After introducing the full general rel
 ativistic expression for the galaxy number density\, I define the theory p
 ower spectrum and describe its relation to observations. Then\, I discuss 
 the issue of infrared divergence\, as general relativistic effects have pr
 eviously been believed to cause a divergent signal contaminating the measu
 rement of primordial non-Gaussianity. I show that there is\, in fact\, no 
 infrared divergence\, as this unphysical behaviour vanishes when accountin
 g for all general relativistic effects consistently. Finally\, I present o
 ur numerical computation of the full galaxy power spectrum\, showing the d
 eviations from the standard prediction caused by the presence of non-diver
 gent terms from relativistic corrections. I conclude that\, as relativisti
 c effects lead to significant corrections at low k\, they need to be taken
  into account in the analysis of large-scale data.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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