English

A transition between bouncing hyper-inflation to {\Lambda}CDM from diffusive scalar fields

General Relativity and Quantum Cosmology 2018-07-30 v3 Cosmology and Nongalactic Astrophysics

Abstract

We consider the history of the universe from a possible big bang or a bounce into a late period of a unified interacting dark energy - dark matter model. The model is based on the Two Measures Theories (T.M.T.) which introduces a metric independent volume element and this allows us to construct a unification of dark energy and dark matter. A generalization of the T.M.T. gives a diffusive non-conservative stress energy momentum tensor in addition to the conserved stress energy tensor which appear in Einstein equations. These leads to a formulation of interacting DE-DM dust models in the form of a diffusive type interacting Unified Dark Energy and Dark Matter scenario. The deviation from Λ\LambdaCDM is determined by the diffusion constant C2C_2. For C2=0C_2=0 the model is indistinguishable from Λ\LambdaCDM. Numerical solutions of the theories show that in some C20C_2 \neq 0 the evolution of the early universe is governed by Stiff equation of state or the universe bounces to hyper inflation. But all of those solutions have a final transition to Λ\LambdaCDM as a stable fixed point for the late universe.

Keywords

Cite

@article{arxiv.1710.10588,
  title  = {A transition between bouncing hyper-inflation to {\Lambda}CDM from diffusive scalar fields},
  author = {David Benisty and Eduardo I. Guendelman},
  journal= {arXiv preprint arXiv:1710.10588},
  year   = {2018}
}

Comments

Updated version, before acceptance for publication

R2 v1 2026-06-22T22:28:47.673Z