Tachyon Condensation and Background Independent Superstring Field Theory

TL;DR

This paper investigates quantum one-loop corrections in open superstring tachyon condensation using boundary string field theory, revealing a renormalized coupling and effective string tension consistent with prior loop analyses.

Contribution

It provides a detailed calculation of one-loop quantum corrections in superstring tachyon condensation within the BSFT framework, highlighting the renormalization effects on the coupling and tension.

Findings

Tachyon field action retains its form at one loop with renormalized parameters.

Effective coupling is modified to include a renormalized closed string coupling.

Results align with general loop effect analyses.

Abstract

We study quantum corrections at the one loop level in open superstring tachyon condensation using the boundary string field theory (BSFT) method. We find that the tachyon field action has the same form as at the disc level, but with a renormalized effective coupling $\lambda' =g_s^{ren}e^{-T^2/4}$ ($g_s^{ren}$ is the renormalized dimensionless closed string coupling, $e^{-T^2/4}$ is the tachyonic field expectation value) and with an effective string tension. This result is in agreement with that based on general analysis of loop effects.