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

Who: David Wands (Institute of Cosmology and Gravitation, University of Portsmouth)
When: Monday, May 12, 2014 at 14:15
Where: The CP³ meeting room

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

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