Conquest of the ghost pyramid of the superstring
Kiyoung Lee, Warren Siegel

TL;DR
This paper introduces a novel BRST operator for superstring theory, leading to a quadratic gauge-fixed action and a new gauge-invariant formulation with first-class constraints, simplifying the ghost structure.
Contribution
It presents a new BRST operator and gauge-invariant action for superstrings, clarifying the structure of ghost fields and constraints.
Findings
New BRST operator for superstring
Quadratic gauge-fixed action derived
Simplified ghost pyramid structure
Abstract
We give a new Becchi-Rouet-Stora-Tyutin operator for the superstring. It implies a quadratic gauge-fixed action, and a new gauge-invariant action with first-class constraints. The infinite pyramid of spinor ghosts appears in a simple way through ghost gamma matrices.
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