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arXiv · 2406.04839

Emergent Universe from an Unstable de Sitter Phase

Molly Burkmar·Marco Bruni
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Abstract

In the Emergent scenario, the Universe should evolve from a non-singular state replacing the typical singularity of General Relativity, for any initial condition. For the scalar field model in [1] we show that only a set of measure zero of trajectories leads to emergence, either from a static state (an Einstein model), or from a de Sitter state. Assuming a scenario based on CDM interacting with a Dark Energy fluid, we show that in general flat and open models expand from a non-singular unstable de Sitter state at high energies; for some closed models this state is a transition phase with a bounce, other closed models are cyclic. A subset of these models are qualitatively in agreement with the observable Universe, accelerating at high energies, going through a matter-dominated decelerated era, then accelerating toward a de Sitter phase.

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Molly Burkmar, Marco Bruni. 2024-06-07. Emergent Universe from an Unstable de Sitter Phase. https://arxiv.org/abs/2406.04839

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