Speaker
Jorge Noreña
(Pontificia Universidad Catolica de Valparaiso)
Description
We study the effect of superhorizon scalar and tensor perturbations on local observers. We will show that constant perturbations and constant gradients don't have physical effects if they were sourced by single-field inflation (they are so-called adiabatic modes). The leading physical effect of superhorizon perturbations comes at second order in derivatives. At this order, they induce a small curvature and anisotropy. We will show that the universe is expected to be described by a Bianchi metric with tiny anisotropy and curvature parameters. These would be perceived as cosmic variance, and thus set the observational floor for these parameters.
Author
Jorge Noreña
(Pontificia Universidad Catolica de Valparaiso)