Particle Production on Half S-brane

TL;DR

This paper investigates particle production during non-BPS D-brane decay, revealing exponential growth in particle number that indicates the breakdown of linear approximation and the need to consider backreaction effects.

Contribution

It provides a detailed analysis of quantum fluctuations around the rolling tachyon, connecting particle production with minisuperspace calculations in non-BPS D-brane decay.

Findings

Particle number grows exponentially at large times.

Linear approximation becomes invalid due to backreaction.

Highlights the importance of including backreaction in decay models.

Abstract

In this paper we will study quantum field theory of fluctuation modes around the rolling tachyon solution on non-BPS D-brane effective action. The goal of this paper is to study particle production during the decay of non-BPS D-brane and explore possible relation with minisuperspace calculation. We find that the number of particles produced on half S-brane exponentially grows for large time which suggests that linearised approximation breaks down and also that backreaction of fluctuation field on classical solution should be taken into account.