Null string evolution in black hole and cosmological spacetimes

TL;DR

This paper explores the behavior of null (zero tension) classical strings in various curved spacetimes, providing new exact solutions that enhance understanding of string propagation in black hole and cosmological backgrounds.

Contribution

It introduces new exact solutions for null strings in Reissner-Nordström black holes and Einstein static universe, advancing the study of string dynamics in curved spacetimes.

Findings

New exact solutions in Reissner-Nordström spacetime

Solutions in Einstein Static Universe and Einstein-Schwarzschild spacetime

Insights into string propagation in curved backgrounds

Abstract

We discuss the problem of the motion of classical strings in some black hole and cosmological spacetimes. In particular, the null string limit (zero tension) of tensile strings is considered. We present some new exact string solutions in Reissner-Nordstr\"om black hole background as well as in the Einstein Static Universe and in the Einstein-Schwarzschild (a black hole in the Einstein Static Universe) spacetime. These solutions can give some insight into a general nature of propagation of strings (cosmic and fundamental) in curved backgrounds.