D=5 Holomorphic Chern-Simons and the Pure Spinor Superstring

TL;DR

This paper explores the relationship between D=5 holomorphic Chern-Simons theory, superstring formalisms, and their scattering amplitudes, highlighting the equivalence of different approaches and their implications for multiloop calculations.

Contribution

It establishes a detailed correspondence between D=5 holomorphic Chern-Simons theory, RNS superstring, and pure spinor superstring formalisms, clarifying their interrelations.

Findings

Equivalence between D=5 holomorphic Chern-Simons and RNS superstring formalisms.

Correspondence between pure spinor superstring and B-RNS-GSS superstring.

Potential for proving amplitude prescription equivalences and understanding multiloop subtleties.

Abstract

The physical states of D=5 holomorphic Chern-Simons theory correspond to on-shell D=10 open superstring states in the cohomology of $q_+$, where $q_+$ is one of the 16 spacetime supersymmetry generators. Scattering amplitudes of these states can be computed either using the usual Ramond-Neveu-Schwarz (RNS) superstring prescription with N=1 worldsheet supersymmetry, or using a topological $\hat c$=5 string theory with twisted N=2 worldsheet supersymmetry. It will be argued that the relation between D=5 holomophic Chern-Simons and the RNS superstring is identical to the relation between the the pure spinor superstring and the recently constructed B-RNS-GSS superstring which has both N=1 worldsheet supersymmetry and D=10 spacetime supersymmetry. Physical states of the pure spinor superstring correspond to on-shell B-RNS-GSS states which are in the cohomology of $\lambda^\alpha q_\alpha$, where $\lambda^\alpha$ is a D=10 pure spinor. And scattering amplitudes of these states can be computed either using the full B-RNS-GSS superstring prescription with N=1 worldsheet supersymmetry, or using the pure spinor superstring amplitude prescription with twisted N=2 worldsheet supersymmetry. This should be useful for proving equivalence of the RNS and pure spinor amplitude prescriptions and for clarifying the relation of their multiloop subtleties.