Particle Production in Tachyon Condensation

TL;DR

This paper investigates particle production during tachyon condensation using various effective actions, revealing that the production rate's finiteness depends on the specific action, confirming earlier findings.

Contribution

It provides exact calculations of particle density in tachyon condensation for different effective actions, highlighting the dependence on the chosen model.

Findings

Particle production rate is finite only for certain effective actions.

Exact results for particle density are obtained using invariant operators.

The study confirms previous results about the finiteness of particle production in tachyon condensation.

Abstract

We study particle production in the tachyon condensation process as described by different effective actions for the tachyon. By making use of invariant operators, we are able to obtain exact results for the density of produced particles, which is shown to depend strongly on the specific action. In particular, the rate of particle production remains finite only for one of the actions considered, hence confirming results previously appeared in the literature.