Boundary String Field Theory, the Boundary State Formalism and D-Brane Tension

TL;DR

This paper explores the connection between boundary string field theory, boundary state formalism, and open-closed string duality to explain accurate D-brane tension ratios.

Contribution

It clarifies how boundary state formalism and open-closed duality underpin recent successful D-brane tension calculations in boundary string field theory.

Findings

Boundary string field theory accurately predicts D-brane tension ratios.

Boundary state formalism explains the success of tension calculations.

Open-closed string duality provides conceptual clarity for these results.

Abstract

Recently a boundary string field theory that had been proposed some time ago, was used to calculate correctly the ratios of D-brane (both BPS and non-BPS) tensions. We discuss how this work is related to the boundary state formalism and open string closed string duality, and argue that the latter clarifies why the correct tension ratios are obtained in these recent calculations.