Video URL
https://pirsa.org/14110185Consistency relations from inflation to the Large Scale Structure
APA
(2014). Consistency relations from inflation to the Large Scale Structure. Perimeter Institute for Theoretical Physics. https://pirsa.org/14110185
MLA
Consistency relations from inflation to the Large Scale Structure. Perimeter Institute for Theoretical Physics, Nov. 27, 2014, https://pirsa.org/14110185
BibTex
@misc{ scivideos_PIRSA:14110185, doi = {10.48660/14110185}, url = {https://pirsa.org/14110185}, author = {}, keywords = {Cosmology}, language = {en}, title = {Consistency relations from inflation to the Large Scale Structure}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2014}, month = {nov}, note = {PIRSA:14110185 see, \url{https://scivideos.org/pirsa/14110185}} }
Abstract
According to the Newtonian intuition, a constant gravitational field has no physical effect on a system since it can always be redefined, and a homogeneous gradient of the gravitational field (i.e. a homogeneous gravitational force) is equivalent to an accelerated reference frame. I will show how to extend this intuition to cosmological scales; in the presence of a single clock a constant curvature perturbation and its gradient can be set to zero through a coordinate transformation. This allows one to connect the squeezed limit of an $n$-point correlation function of the curvature perturbation to an (n+1)-point correlation function in the limit in which one of the momenta is very small (the so-called squeezed limit). These consistency relations are valid from inflation to the LSS. As an example, I will use them to write down a non-perturbative relativistic relation between galaxy number over-density correlation functions.