The energy-momentum tensor of perturbed tachyon matter

TL;DR

This paper investigates how initial nonhomogeneous perturbations in a tachyon background evolve over time, demonstrating that they lead to nonhomogeneous pressureless tachyon matter in the far future, using worldsheet string theory calculations.

Contribution

It introduces a method to compute the energy-momentum tensor of perturbed tachyon matter from worldsheet string theory, revealing the evolution to pressureless tachyon matter.

Findings

Perturbations evolve into pressureless tachyon matter

Energy-momentum tensor becomes nonhomogeneous over time

Method established for calculating tensor from string theory

Abstract

We add an initial nonhomogeneous perturbation to an otherwise homogeneous condensing tachyon background and compute its space time energy-momentum tensor from worldsheet string theory. We show that in the far future the energy-momentum tensor corresponds to nonhomogeneous pressureless tachyon matter.