Backgrounds in Boundary String Field Theory

TL;DR

This paper explores how closed string backgrounds influence boundary string field theory, introducing dual boundary fields to achieve background independence and analyzing their effects on open string excitations and stability.

Contribution

It introduces dual boundary fields to incorporate closed string backgrounds into boundary string field theory, establishing a novel correspondence with open string excitations.

Findings

Dual boundary fields are essential for background independence.

A correspondence between closed string backgrounds and open string excitations is established.

RG flow and stability are analyzed in a specific example.

Abstract

We study the role of closed string backgrounds in boundary string field theory. Background independence requires the introduction of dual boundary fields, which are reminiscent of the doubled field formalism. We find a correspondence between closed string backgrounds and collective excitations of open strings described by vertex operators involving dual fields. Renormalization group flow, solutions and stability are discussed in an example.