BRST Properties of New Superstring States

TL;DR

This paper investigates the BRST invariance and physicality of brane-like states in superstring theory, demonstrating their validity as physical states through detailed BRST property analysis.

Contribution

It provides a rigorous proof that brane-like states are BRST invariant and non-trivial, establishing their status as physical states in superstring theory.

Findings

Brane-like states are confirmed to be BRST invariant.

These states are shown to be BRST non-trivial.

The analysis applies to both open and closed superstring sectors.

Abstract

Brane-like states are defined by physical vertex operators in NSR superstring theory, existing at nonzero pictures only. These states exist both in open and closed string theories, in the NS and NS-NS sectors respectively. In this paper we present a detailed analysis of their BRST properties, giving a proof that these vertex operators are physical, i.e. BRST invariant and BRST non-trivial.