Taming the b antighost with Ramond-Ramond flux

TL;DR

This paper explores the construction of the b antighost in the pure spinor formalism for superstrings within Type II backgrounds with Ramond-Ramond flux, showing it can be built without non-minimal variables and analyzing its properties.

Contribution

It demonstrates that in certain Type II superstring backgrounds, the b antighost can be constructed without non-minimal variables and examines its properties in curved backgrounds.

Findings

b antighost can be constructed without non-minimal variables in specific backgrounds

The antiholomorphic derivative of the b antighost is BRST-trivial in these backgrounds

Properties of the b antighost are analyzed in AdS_5 x S^5 and generic curved spaces

Abstract

In the pure spinor formalism for the superstring, the b antighost is necessary for multiloop amplitude computations and is a composite operator constructed to satisfy {Q,b}=T where Q is the BRST operator and T is the holomorphic stress-tensor. In superstring backgrounds with only NS-NS fields turned on, or in flat space, one needs to introduce "non-minimal" variables in order to construct the b antighost. However, in Type II backgrounds where the Ramond-Ramond bispinor field-strength satisfies certain conditions, the b antighost can be constructed without the non-minimal variables. Although the b antighost in these backgrounds is not holomorphic, its antiholomorphic derivative is BRST-trivial. We discuss the properties of this operator both in the AdS_5 x S^5 background and in a generic curved background.