Small Cosmological Constants from a Modified Randall-Sundrum Model

TL;DR

This paper proposes a modification to the Randall-Sundrum model to generate a small four-dimensional cosmological constant, addressing the cosmological constant problem by analyzing bulk and brane vacuum energies.

Contribution

It introduces a new mechanism inspired by the gauge hierarchy solution in RS models to produce a small effective cosmological constant.

Findings

Bulk cosmological constant and brane vacuum energies are naturally of expected values.

A modified RS model can generate a small four-dimensional cosmological constant.

The approach offers a potential solution to the cosmological constant problem.

Abstract

We study a mechanism, inspired from the mechanism for generating the gauge hierarchy in Randall-Sundrum model, to investigate the cosmological constant problem. First we analyze the bulk cosmological constant and brane vacuum energies in RS model. We show that the five-dimensional bulk cosmological constant and the vacuum energies of the two branes all obtain their natural values. Finally we argue how we can generate a small four-dimensional effective cosmological constant on the branes through modifying the original RS model.