Fundamental Plasmid Strings and Black Rings

TL;DR

This paper constructs semiclassical rotating string states and matches them with supergravity solutions for rotating dipole rings, revealing insights into their entropy, angular momenta, and decay mechanisms.

Contribution

It provides a detailed correspondence between excited fundamental string states and supergravity rotating rings, including entropy and decay processes.

Findings

Matching of string states with supergravity solutions in mass, radius, and angular momentum

Reproduction of entropy dependence through string state degeneracy

Interpretation of decay as superradiant emission from ergoregions

Abstract

We construct excited states of fundamental strings that admit a semiclassical description as rotating circular loops of string. We identify them with the supergravity solutions for rotating dipole rings. The identification involves a precise match of the mass, radius and angular momentum of the two systems. Moreover, the degeneracy of the string state reproduces the parametric dependence of the entropy in the supergravity description. When the solutions possess two macroscopic angular momenta, they are better described as toroidal configurations (tubular loops) instead of loops of string. We argue that the decay of the string state can be interpreted as superradiant emission of quanta from the ergoregion of the rotating ring.