Localized gravity in non-compact superstring models

TL;DR

This paper explores a string theory mechanism for localized gravity that causes deviations from Newton's law at large distances, applicable to various non-compact Calabi-Yau, orbifold, and orientifold models.

Contribution

It introduces a string-theoretic mechanism for gravity localization in non-compact models, analyzing its implications and observational viability.

Findings

Localized higher derivative terms are negligible at observable scales.

The mechanism applies broadly to Calabi-Yau, orbifold, and orientifold models.

Observations on the massless open string spectrum are provided.

Abstract

We discuss a string-theory-derived mechanism for localized gravity, which produces a deviation from Newton's law of gravitation at cosmological distances. This mechanism can be realized for general non-compact Calabi-Yau manifolds, orbifolds and orientifolds. After discussing the cross-over scale and the thickness in these models we show that the localized higher derivative terms can be safely neglected at observable distances. We conclude by some observations on the massless open string spectrum for the orientifold models.