Multiple $\Lambda$CDM cosmology with string landscape features and future singularities

TL;DR

This paper explores multiple $\\Lambda$CDM cosmologies inspired by string landscape features, analyzing their future singularities and matching observational data through various dark energy models.

Contribution

It introduces a classical analog of the Casimir effect in cosmology, constructing models that replicate $\\Lambda$CDM behavior with diverse future singularities and observational consistency.

Findings

Models can match recent astronomical data.

Various future singularities like Big Rip and Little Rip are possible.

Multiple cosmological scenarios with different fates are demonstrated.

Abstract

Multiple $\Lambda$CDM cosmology is studied in a way that is formally a classical analog of the Casimir effect. Such cosmology corresponds to a time-dependent dark fluid model or, alternatively, to its scalar field presentation, and it motivated by the string landscape picture. The future evolution of the several dark energy models constructed within the scheme is carefully investigated. It turns out to be almost always possible to choose the parameters in the models so that they match the most recent and accurate astronomical values. To this end, several universes are presented which mimick (multiple) $\Lambda$CDM cosmology but exhibit Little Rip, asymptotically de Sitter, or Type I, II, III, and IV finite-time singularity behavior in the far future, with disintegration of all bound objects in the cases of Big Rip, Little Rip and Pseudo-Rip cosmologies.