The Gravitational Field of String Matter When the Dilaton is Massive

TL;DR

This paper numerically investigates the gravitational field of a star composed of massive, neutral string states with a massive dilaton, revealing simple scaling laws and a halo structure around the singularity.

Contribution

It introduces a numerical analysis of the gravitational effects of string matter with a massive dilaton, highlighting scaling properties and halo formation.

Findings

No horizon forms around the string matter.

A halo with large scalar curvature surrounds the singularity.

Halo size is inversely proportional to the dilaton mass.

Abstract

We study numerically the gravitational field of a star made of massive and neutral string states for the case in which the dilaton is massive. The solution exhibits very simple scaling properties in the dilaton mass. There is no horizon and the singularity is surrounded by a halo (the physical size of which is inversely proportional to the dilaton mass) where the scalar curvature is very large and proportional to the square of the dilaton mass.