Galaxy Power Spectrum in General Relativity

by Nastassia Grimm

Thursday 11 Jun 2020, 16:30 → 18:30 Europe/Zurich

CERN

In this talk, I present the impact of general relativistic
effects on the galaxy power spectrum. After introducing the full general
relativistic expression for the galaxy number density, I define the
theory power spectrum and describe its relation to observations. Then, I
discuss the issue of infrared divergence, as general relativistic
effects have previously been believed to cause a divergent signal
contaminating the measurement of primordial non-Gaussianity. I show that
there is, in fact, no infrared divergence, as this unphysical behaviour
vanishes when accounting for all general relativistic effects
consistently. Finally, I present our numerical computation of the full
galaxy power spectrum, showing the deviations from the standard
prediction caused by the presence of non-divergent terms from
relativistic corrections. I conclude that, as relativistic effects lead
to significant corrections at low k, they need to be taken into account
in the analysis of large-scale data.

 

Zoom coordinates:

https://cern.zoom.us/j/99377496227

Meeting ID: 993 7749 6227

Password: 636648

Abstract: