A Note on Graviton Amplitudes for New Twistor String Theories
V.P. Nair
TL;DR
This paper discusses a new class of twistor string theories, focusing on a particular N=8 supergravity model, and provides arguments for its chiral nature based on helicity amplitude analysis.
Contribution
It introduces a novel twistor string theory with N=8 supergravity content and suggests its chiral properties through amplitude analysis.
Findings
Helicity amplitude (+ - -) vanishes for gravitons
The theory likely describes chiral N=8 supergravity
Potential deviation from Einstein supergravity
Abstract
A new class of twistor string theories were recently constructed by Abou-Zeid, Hull and Mason. The most interesting one of these theories has the particle content of N=8 supergravity. Arguments are given for the vanishing of the (+ - -)-helicity amplitude for gravitons which suggest that this theory describes a chiral N=8 supergravity rather than Einstein supergravity.
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