Limits of isotropic universes with interacting fluids

Abstract

We find various asymptotic limits of universes containing two interacting fluids which interact and exchange energy. We study the finite-time singularities that may develop in these cosmologies and obtain the asymptotic behaviours of the solutions near such blow up regimes.

4 pages, contribution for the Proceedings of the MG13 Meeting on General Relativity, Stockholm, July 2012; v2: eqn numbering corrected