CP3 Lunch - Averaging problem and relative entropy in the perturbed Universe - Nan Li

by Dr Nan Li

Wednesday 18 Feb 2009, 13:00 → 13:50 Europe/Brussels

Cycl.06

Due to the non-commutation of spatial averaging and temporal evolution, inhomogeneities and anisotropies (cosmic structures) influence the evolution of the averaged Universe via the cosmological backreaction mechanism. We study the dynamics of backreaction effects and further introduce a relative entropy to characterize the structure formation in the perturbed Universe. We show this entropy increases during the cosmological evolution.