Tachyon Condensation in Large Magnetic Fields with Background Independent String Field Theory

TL;DR

This paper investigates tachyon condensation using background independent open string field theory, demonstrating simplified calculations in large B fields and confirming the form of the tachyon potential with new solitonic solutions representing lower-dimensional branes.

Contribution

It provides an exact computation of the tachyon potential in large B field backgrounds and identifies solitonic solutions corresponding to lower-dimensional branes.

Findings

Confirmed the form of the exact tachyon potential.

Simplified the computation of the string field theory action in large B fields.

Discovered solitonic solutions representing lower-dimensional unstable branes.

Abstract

We discuss the problem of tachyon condensation in the framework of background independent open string field theory. We show, in particular, that the computation of the string field theory action simplifies considerably if one looks at closed string backgrounds with a large B field, and can be carried out exactly for a generic tachyon profile. We confirm previous results on the form of the exact tachyon potential, and we find, within this framework, solitonic solutions which correspond to lower dimensional unstable branes.