Cosmology of Brane-worlds

TL;DR

This paper reviews brane cosmology where our universe is a 3-brane in a 5D anti-de Sitter space, highlighting unique early universe evolution and the role of dark radiation from bulk gravitons.

Contribution

It provides an overview of brane-world cosmology focusing on high-energy behavior and the gravitational effects of the bulk, including dark radiation generation.

Findings

Unconventional high-energy cosmological evolution

Dark radiation as a bulk gravitational effect

Bulk graviton production during the early universe

Abstract

This talk presents an overview of the brane cosmology scenario, based on the idea that our Universe is a 3-brane embedded in a five-dimensional anti-de Sitter bulk space-time. Special emphasis is put on the novel features of this scenario: an unconventional cosmological evolution at high energy densities, i.e. in the early universe, and dark radiation, that embodies the gravitational effects of the bulk onto the brane, and which is shown to be generated during the high energy era by the production of bulk gravitons.