Einstein's signature in large-scale structure: non-Gaussianity, scale-dependent bias and GR

Series: 
The London Relativity and Cosmology Seminar
Speaker: 
David Wands (Portsmouth)
Date: 
February 25th, 2015 at 16:30
Room: 
See Talk Details
Abstract: 

The distribution of primordial density perturbations is a key discriminant between different models for the origin of structure in the very early universe. Galaxies are biased tracers of this underlying matter distribution, and deviations from a simple Gaussian distribution can give rise to scale-dependent bias on the largest observable scales. Studying very large scales, close to the Hubble-horizon, requires a consistent relativistic interpretation, but standard treatments (and numerical simulations) are based on Newtonian gravity. I will show how Einstein's general relativity gives rise to a characteristic non-Gaussian signature in the primordial distribution of matter and hence galaxies on large scales. - G. O. Jones 516