Tachyon Kinks in Boundary String Field Theory

TL;DR

This paper explores various static soliton solutions in boundary string field theory with tachyons and electromagnetic fields, revealing their properties and interpretations as branes, and matching their spectra with Dirac-Born-Infeld theory.

Contribution

It systematically classifies and analyzes static codimension-one solitons in boundary string field theory, including new solutions with electromagnetic fields and their brane interpretations.

Findings

Array of kink-antikink solutions without electromagnetic fields.

Multiple types of solitons with electromagnetic coupling, including BPS kinks and bounces.

Spectrum of solutions matches Dirac-Born-Infeld effective theory.

Abstract

We study tachyon kinks with and without electromagnetic fields in the context of boundary string field theory. For the case of pure tachyon only an array of kink-antikink is obtained. In the presence of electromagnetic coupling, all possible static codimension-one soliton solutions such as array of kink-antikink, single topological BPS kink, bounce, half kink, as well as nonBPS topological kink are found, and their properties including the interpretation as branes are analyzed in detail. Spectrum of the obtained kinks coincides with that of Dirac-Born-Infeld type effective theory.