Problems and cures (partial) for holographic cosmology
Abstract
Description
We analyze the validity of the generalized covariant entropy bound near the apparent horizon of isotropic expanding cosmological models. We encounter violations of the bound for cosmic times smaller than a threshold. By introducing an infrared cutoff we are able to mantain the bound for a radiation dominated universe. We study different physical mechanisms to restore the bound, as a non-additivity of the entropy at a fundamental level and/or a cosmological uncertainty relation.
9 pages, contribution to the proceedings of "String Phenomenology 2003" conference, Durham, UK, July 29-August 4
9 pages, contribution to the proceedings of "String Phenomenology 2003" conference, Durham, UK, July 29-August 4