Multiple Lambda cosmology: dark fluid with time-dependent equation of state as classical analog of cosmological landscape

TL;DR

This paper explores a cosmological model with a time-dependent dark fluid equation of state that can produce multiple de Sitter phases and transitions between different cosmological constant regions, offering insights into the cosmological landscape.

Contribution

It introduces a classical analog of the cosmological landscape using a time-dependent EoS dark fluid in FRW universe, allowing transitions between various de Sitter and cosmological constant regimes.

Findings

Multiple de Sitter solutions are possible.

Transitions between positive and negative cosmological constants are feasible.

The model offers a new perspective on the cosmological constant problem.

Abstract

We discuss FRW universe with time-dependent EoS dark fluid which leads to multiple de Sitter space. This model (as well as its scalar-tensor version) may be considered as some classical analog of cosmological landscape. The universe expansion history may look as transitions between different deSitter eras what suggests the interesting solution for cosmological constant problem. For specific time-dependent EoS dark fluid the possibility of transitions between universe regions with positive and negative cosmological constant is also established.