Friedmann-Robertson-Walker like cosmologies with spherical symmetry

TL;DR

This paper explores a class of cosmological models combining Friedmann-Robertson-Walker universes with traversable wormholes, analyzing their properties and evolution with a focus on separating cosmic and wormhole matter contributions.

Contribution

It extends previous work by providing a more detailed analysis of FRW-like cosmologies with wormholes, considering a split matter content and broader applicability to general cosmological models.

Findings

More comprehensive analysis of wormhole cosmologies than previous studies

Application of models to a wider class of cosmological evolutions

Insights into matter distribution and dynamics in wormhole-influenced universes

Abstract

We reconsider the cosmological model discussed by Sung-Won Kim [Phys. Rev D 53, 6889 (1996)] in the context of Friedmann-Robertson-Walker cosmologies with a traversable wormhole, where it is assumed that the matter content is divided into two parts: the cosmic part that depends on time only and the wormhole part that depends on space only. The cosmic part obeys the barotropic equation of state $p_c=\gamma \rho_c$. The complete analysis requires further care and reveals more interesting results than what was previously shown by the author. They can be readily applied to the evolution of a large class of cosmological models which are more general than FRW models.