Moduli Forces in String Models with Large Internal Dimensions

TL;DR

This paper estimates the strength and range of moduli-mediated forces in type I string models with large internal dimensions, revealing potential observable deviations from gravity at millimeter scales.

Contribution

It provides the first detailed estimates of force magnitudes and ranges mediated by various string moduli in models with large extra dimensions.

Findings

Twisted moduli can mediate forces much stronger than gravity with millimeter range.

Dilaton and untwisted moduli can produce forces about 100 times stronger than gravity.

Such forces could be detectable with current experimental techniques.

Abstract

We estimate the strength and range of forces mediated by string moduli in type I string models with two (or more) large internal dimensions. We find that forces mediated by twisted moduli which live on the brane world--volume can mediate forces which are orders of magnitude stronger than gravity with a range up to a milimeter. If they exist, these forces can be easily observed in present experiments. On the other hand, forces mediated by the dilaton and untwisted moduli are about a hundred times stronger than gravity and may be observed depending on their range.