D-Branes as Unstable Lumps in Bosonic Open String Field Theory

TL;DR

This paper constructs Dp-branes as unstable lumps in bosonic open string field theory, demonstrating good tension agreement and gauge field emergence, with analysis of level truncation effects.

Contribution

It introduces a method to realize Dp-branes as lumps in string field theory and analyzes their properties using level truncation techniques.

Findings

Good quantitative agreement with D-brane tension at lowest level truncation

Emergence of U(1) gauge field zero mode via a Randall-Sundrum-like mechanism

Analysis of next level corrections for p=24

Abstract

We construct Dp-branes in bosonic string theory as unstable lumps in a truncated string field theory of open strings on a D25-brane. We find that the lowest level truncation gives good quantitative agreement with the predicted D-brane tension and low-lying spectrum of the D-brane for sufficiently large p and study the effect of the next level corrections for p=24. We show that a U(1) gauge field zero mode on the D-brane arises through a mechanism reminiscent of the Randall-Sundrum mechanism for gravity.