Four Dimensional Anomaly-Free Twistor String

Abstract

This paper presents a covariant twistor string model in four dimensions coupled to two-dimensional worldsheet gravity with an anomaly-free BRST charge. The model contains two twistors and two fermionic bi-spinors with incidence related gauge symmetries and an SU(2) gauge symmetry between the twistors. It is shown that the model leads to familiar gravitational N${}^k$MHV amplitudes and has modular-invariant one-loop amplitudes.

18 pages

References in corpus (2)

• Ambitwistor strings in 4-dimensions
• Twistor Strings for N=8 Supergravity

Cited by in corpus (1)

• A Note on Classical Aspects of the Four Dimensional Anomaly-Free Twistor String