Cosmology of One Extra Dimension with Localized Gravity

TL;DR

This paper analyzes two five-dimensional universe models with localized gravity, finding one scenario viable for cosmology and the other problematic due to predicted contraction and related issues.

Contribution

It compares two recent models of five-dimensional universes with localized gravity, assessing their cosmological viability and implications.

Findings

Non-compact fifth dimension scenario is potentially viable.

The hierarchy problem scenario predicts a contracting universe.

The contracting universe leads to various cosmological problems.

Abstract

We examine the cosmology of the two recently proposed scenarios for a five dimensional universe with localized gravity. We find that the scenario with a non-compact fifth dimension is potentially viable, while the scenario which might solve the hierarchy problem predicts a contracting universe, leading to a variety of cosmological problems.