Non-perturbative relations for inflation and the Large Scale Structure

Who: Jorge Norena (University of Geneva)
When: Thursday, March 26, 2015 at 14:15
Where: The CP³ meeting room

In some sense the Large Scale Structure (LSS) is to cosmology what QCD is to particle physics. Much of the new physics that we hope to discover in the near future relies on experiments that probe it, but much of the information is beyond a simple perturbative treatment. I will illustrate this by discussing the measurement of primordial non-Gaussianity in the LSS, which would provide information about the non-linear interactions of the inflaton much as a scattering experiment does for the particles of the standard model. I will argue that this measurement is challenging due to the non-linearity of the LSS, and present one of the ways in which this can be attacked by writing a non-perturbative relation between correlation functions that is a Ward identity related to a non-linearly realized symmetry analogous to Einstein’s elevator.

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