Cosmological evolution with brane-bulk energy exchange

TL;DR

This paper explores how energy exchange between a brane and bulk influences cosmological evolution, revealing diverse behaviors including acceleration and increased dark matter, depending on energy transfer mechanisms and topology.

Contribution

It provides a detailed analysis of brane-bulk energy exchange effects on cosmology within a non-factorizable geometry, highlighting new solution classes and their properties.

Findings

Accelerating cosmological solutions are common.

Low-density flat universes predict more dark matter.

Spatially compact models delay recollapse.

Abstract

The consequences for the brane cosmological evolution of energy exchange between the brane and the bulk are analysed in detail, in the context of a non-factorizable background geometry with vanishing effective cosmological constant on the brane. A rich variety of brane cosmologies is obtained, depending on the precise mechanism of energy transfer, the equation of state of brane-matter and the spatial topology. An accelerating era is generically a feature of our solutions. In the case of low-density flat universe more dark matter than in the conventional FRW picture is predicted. Spatially compact solutions are found to delay their recollapse.