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

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arxiv 1710.10588 v3 pith:UCF4C7VX submitted 2017-10-29 gr-qc astro-ph.CO

classification gr-qcastro-ph.CO
keywords darkenergylambdauniversediffusiveinteractingmattermodel
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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 $\Lambda$CDM is determined by the diffusion constant $C_2$. For $C_2=0$ the model is indistinguishable from $\Lambda$CDM. Numerical solutions of the theories show that in some $C_2 \neq 0$ 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 $\Lambda$CDM as a stable fixed point for the late universe.

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Cited by 1 Pith paper

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  1. The Scale Factor Potential Approach to Inflation

    gr-qc 2019-09 reject novelty 3.0 of 10

    The paper reparametrizes slow-roll inflation through a scale factor potential and constructs an example potential, but the chosen 60 e-fold branch is inconsistent with its own first-minimum end condition.

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