Isotropization in Chaplygin matter universes connected by a wormhole

TL;DR

This paper explores cosmological models with Chaplygin matter connected by a wormhole, analyzing their evolution and conditions for de Sitter phases, highlighting a unique scenario for early accelerated expansion.

Contribution

It introduces a classification of Chaplygin matter cosmologies with wormholes and identifies conditions for de Sitter regimes within these models.

Findings

Only one scenario involves a de Sitter phase.

The de Sitter phase describes the earliest accelerated expansion.

The models include a static wormhole region connecting two horizons.

Abstract

Chaplygin anisotropic matter governing the cosmological evolution in two identical universes with an intermediate static spherically symmetric region is considered. The static region contains a wormhole allowing one to pass etween two horizons. The metric in the non-static region represents a kind of an anisotropic Kantowski-Sachs cosmological model starting from a horizon instead the initial singularity. A classification of the cosmologies with a monotonic late stage is presented. It is shown that only one scenario can involve a de Sitter regime. The scales in the de Sitter phase allows one to describe the earliest accelerated expansion on the classical level.