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

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.

References added, typos corrected, minor changes

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