Type IIB superstring vertex operator from the -8 picture

TL;DR

This paper introduces a new method for constructing massless Type IIB vertex operators in the pure spinor formalism, demonstrating their relation to existing operators via picture-raising in flat space.

Contribution

It explicitly computes the picture-raising procedure for Type IIB vertex operators in the pure spinor formalism, confirming the proposed construction in flat background.

Findings

Explicit form of Type IIB vertex operators in the -8 picture.

Verification of the picture-raising procedure in flat space.

Ongoing work on extending the method to AdS5×S5 background.

Abstract

A new procedure was recently proposed for constructing massless Type IIB vertex operators in the pure spinor formalism. Instead of expressing these closed string vertex operators as left-right products of open string vertex operators, they were instead constructed from the complex N=2 d=10 superfield whose lowest real and imaginary components are the dilaton and Ramond-Ramond axion. These Type IIB vertex operators take a simple form in the -8 picture and are related to the usual vertex operators in the zero picture by acting with picture-raising operators. In this paper, we compute explicitly this picture-raising procedure and confirm this proposal in a flat background. Work is in progress on confirming this proposal in an $AdS_5\times S^5$ background.