Gauge Invariance and Tachyon Condensation in Cubic Superstring Field Theory

TL;DR

This paper investigates gauge invariance in cubic open superstring field theory using level truncation and introduces a new gauge that effectively computes the tachyon potential without restrictions at a specific truncation level.

Contribution

It proposes a new gauge choice for fermionic string field theory that overcomes limitations of the Feynman-Siegel gauge in level truncation calculations.

Findings

The new gauge is more suitable for tachyon potential calculations.

The gauge has no restrictions on its validity at level (2,6).

Gauge invariance considerations are applied to tachyon condensation analysis.

Abstract

The gauge invariance of cubic open superstring field theory is considered in a framework of level truncation, and applications to the tachyon condensation problem are discussed. As it is known, in the bosonic case the Feynman-Siegel gauge is not universal within the level truncation method. We explore another gauge that is more suitable for calculation of the tachyon potential for fermionic string at level (2,6). We show that this new gauge has no restrictions on the region of its validity at least at this level.