Cosmological solutions of braneworlds with warped and compact dimensions

TL;DR

This paper explores cosmological solutions in braneworld models with warped and compact dimensions, deriving Friedmann equations and showing that six-dimensional models can recover standard cosmology without fine-tuning.

Contribution

It provides new solutions for cosmological braneworld models with stabilized radions and analyzes conditions for recovering standard Friedmann equations.

Findings

Multiple bulk solutions identified for warped and compact dimensions.

Standard Friedmann equations can be obtained in six-dimensional models without fine-tuning.

Both one and two brane scenarios are analyzed.

Abstract

We study cosmological aspects of braneworld models with a warped dimension and an arbitrary number of compact dimensions. With a stabilized radion, a number of different cosmological bulk solutions are found in a general case. Both one and two brane models are considered. The Friedmann equation is calculated in each case. Particular attention is paid to six dimensional models where we find that the usual Friedmann equation can typically be recovered without fine-tuning.