Classical Dynamics of Macroscopic Strings

TL;DR

This paper provides dynamical evidence supporting the idea that certain static supergravity solutions are actually representations of fundamental strings, by analyzing forces, scattering amplitudes, and moduli space metrics.

Contribution

It demonstrates through multiple methods that the supergravity solutions behave like fundamental strings in the low-energy limit, confirming a long-standing conjecture.

Findings

Trivial scattering in the low-energy limit

Force calculations support string interpretation

Moduli space analysis aligns with fundamental string behavior

Abstract

In recent work, Dabholkar {\it et al.} constructed static ``cosmic string" solutions of the low-energy supergravity equations of the heterotic string, and conjectured that these solitons are actually exterior solutions for infinitely long fundamental strings. In this paper we provide compelling dynamical evidence to support this conjecture by computing the dynamical force exerted by a solitonic string on an identical test-string limit, the Veneziano amplitude for the scattering of macroscopic winding states and the metric on moduli space for the scattering of two string solitons. All three methods yield trivial scattering in the low-energy limit.