Speaker
Description
I show how the coincidence limits of the massless, minimally coupled scalar propagator and its first two derivatives facilitate the summation of large logarithms from inflationary gravitons using a variant of Starobinsky's stochastic formalism. I derive analytic approximations for these correlators that are valid for any cosmology which has undergone an epoch of primordial inflation. A fascinating feature of these correlators is that they transmit the high scales of primordial inflation to arbitrarily late times. I demonstrate the method by explicitly evolving a nonlinear sigma model (which has the same derivative couplings as gravity) through primordial inflation to late times. This talk is based on arXiv:2305.17641, 2302.11528, 2302.04808 and 2110.08715.
