Lumps in level truncated open string field theory

TL;DR

This paper computes the mass ratios of D-branes in open bosonic string field theory using a modified level truncation method, showing rapid convergence and supporting the approximation's consistency.

Contribution

It provides new numerical evidence for the accuracy of the modified level truncation approach in string field theory.

Findings

Mass ratios converge rapidly to expected values

Supports the validity of the modified level truncation approximation

Extends results to D-branes with 1<d<7

Abstract

The ratios of the masses of D(p-d) branes to the masses of Dp in open bosonic string field theory are computed within the modified level truncation approximation of Moeller, Sen and Zweibach. At the lowest non-trivial truncation requiring the addition of new primary states, we find evidence of rapid convergence to the expected result for 1<d<7 providing additional evidence for the consistency of this approximation.