Chaplygin Gas Cosmology - Unification of Dark Matter and Dark Energy

TL;DR

This paper explores how incorporating string theory effects, specifically the Kalb-Ramond field, into Chaplygin gas models can resolve issues with structure formation, unifying dark matter and dark energy effectively.

Contribution

It introduces nonadiabatic perturbations via string theory effects to improve the viability of Chaplygin gas cosmology.

Findings

Nonadiabatic perturbations enable successful structure formation.

String theory effects can resolve previous model failures.

Unified dark matter and dark energy model improved.

Abstract

The models that unify dark matter and dark energy based upon the Chaplygin gas fail owing to the suppression of structure formation by the adiabatic speed of sound. Including string theory effects, in particular the Kalb-Ramond field, we show how nonadiabatic perturbations allow a successful structure formation.