Cyclic Universe in RTG: Anisotropy Problem

Abstract

For the flat FLRW model of Universe evolution in RTG a new model of dark energy is proposed. It is a global scalar field \(\Phi \) with the \(\frac{{{{\mu }^{2}}{{\Phi }^{2}}}}{2}\) potential. It ensures cosmological acceleration at the present time and a bounce at the latе times. At the contraction stage Kazner-like growing anisotropy of Riemannian metrics will break a mass of the graviton bounce mechanism near the Big Bang in FLRW case. It. In order to save the cyclic model one probably has to add some exotic fields, like galileons etc. There is also noncyclic option, when small enough graviton mass terms are significant only at the end of expansion. During next contraction epoch after bounce, an anisotropy grows and the matter density finally reaches the Planck one.