Dynamics of Brane-World Cosmological Models

TL;DR

This paper demonstrates that in brane-world cosmological models, the initial singularity is generally isotropic, which naturally sets the stage for inflation and offers a consistent framework for early universe cosmology.

Contribution

It shows that the initial singularity in brane-world models is typically isotropic, supporting the natural occurrence of inflation without fine-tuning.

Findings

Initial singularity is isotropic in homogeneous brane-world models

Isotropic initial conditions support the onset of inflation

Brane cosmology provides a self-consistent early universe scenario

Abstract

We show that generically the initial singularity is isotropic in spatially homogeneous cosmological models in the brane-world scenario. We then argue that it is plausible that the initial singularity is isotropic in typical brane world cosmological models. Therefore, brane cosmology naturally gives rise to a set of initial data that provide the conditions for inflation to subsequently take place, thereby solving the initial conditions problem and leading to a self--consistent and viable cosmology.