Localized Gravity and Large Hierarchy from String Theory ?

TL;DR

This paper constructs a non-supersymmetric brane-world model within string theory that achieves localized gravity and a large hierarchy of scales using stringy moduli like the axion-dilaton system.

Contribution

It introduces a novel string-theoretic brane-world setup with localized gravity and hierarchy, leveraging non-trivial moduli for the first time.

Findings

Gravity is localized on the brane.

A large hierarchy between bulk and brane scales is achieved.

The model is based on Type-IIB string theory with non-trivial moduli.

Abstract

Within a $D$-dimensional superstring spacetime, we construct a non-supersymmetric brane-world with localized gravity and large hierarchy between the scale in the bulk, $M_D$, and the scale on the brane, $M_{D-2}$. The localization of gravity and the large hierarchy are both guaranteed by the presence of non-trivial stringy moduli, such as the axion-dilaton system for the Type-IIB string theory.