Fundamental String Solutions in Open String Field Theories

TL;DR

This paper constructs and analyzes solutions in open string field theories that represent fundamental strings ending on D-branes, demonstrating their properties and BPS nature in superstring theory.

Contribution

It provides explicit order-by-order solutions in open string field theories corresponding to fundamental strings, including full order properties and BPS status in superstring theory.

Findings

Solutions correspond to Callan-Maldacena in Born-Infeld theory

Solutions are constructed order by order in alpha'

Superstring solutions are shown to be 1/2 BPS at full order

Abstract

In Witten's open cubic bosonic string field theory and Berkovits' superstring field theory we investigate solutions of the equations of motion with appropriate source terms, which correspond to Callan-Maldacena solution in Born-Infeld theory representing fundamental strings ending on the D-branes. The solutions are given in order by order manner, and we show some full order properties in the sense of (alpha)'-expansion. In superstring case we show that the solution is 1/2 BPS in full order.