New Twistor String Theories revisited

TL;DR

This paper revisits a gauged twistor string theory related to N=8 supergravity, analyzing its equations of motion, revealing chiral interaction restrictions, and confirming amplitude consistency with Einstein gravity.

Contribution

It provides a detailed analysis of the equations of motion in a modified twistor string theory, highlighting its implications for supergravity and string interactions.

Findings

Negative helicity graviton vanishes on-shell.

Chiral nature of interactions is confirmed.

Agreement of a specific amplitude with Einstein gravity.

Abstract

A gauged version of Berkovits twistor string theory featuring the particle content of N=8 supergravity was suggested by Abou-Zeid, Hull and Mason. The equations of motion for a particular multiplet in the modified theory are examined on the level of basic twistor fields and thereby shown to imply the vanishing of the negative helicity graviton on-shell. Additionally, the restrictions emerging from the equation of motion for the new gauge field \bar{B} reveal the chiral nature of interactions in theories constructed in this manner. Moreover, a particular amplitude in Berkovits open string theory is shown to be in agreement with the corresponding result in Einstein gravity.