Our Universe from the cosmological constant

TL;DR

This paper explores a cyclic universe model driven by a cosmological constant, where the contracting phase's de Sitter temperature influences bounce, inflation, and reheating, proposing observational tests for this scenario.

Contribution

It introduces a novel cyclic cosmology model based on the conservation of the cosmological constant through a bounce, linking de Sitter temperature to universe reheating.

Findings

De Sitter temperature can induce radiation filling the universe.

The model suggests a cyclic universe with repeated bounces.

Possible observational tests for the cyclic scenario are proposed.

Abstract

In this article, we consider a bouncing Universe, as described for example by Loop Quantum Cosmology. If the current acceleration is due to a true cosmological constant, this constant is naturally conserved through the bounce and the Universe should also be in a (contracting) de Sitter phase in the remote past. We investigate here the possibility that the de Sitter temperature in the contracting branch fills the Universe with radiation and causes the bounce and the subsequent inflation and reheating. We also consider the possibility that this gives rise to a cyclic model of the Universe and suggest some possible tests.