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Institute for the Physics and Mathematics of the UniverseWPI

Gauge Theory, Gravity and Twistor String Scattering Amplitudes

Date: 20. February, from 15:30
Place: Room 633, 6th floor, Research Centers Building, Kashiwa Campus of the University of Tokyo.
Speaker: Mohab Abou Zeid (KEK)
Title: Gauge Theory, Gravity and Twistor String Scattering Amplitudes
Abstract: I will present a modification of twistor string theory which gives the spectrum of super Yang-Mills theory coupled to Einstein supergravity instead of the higher derivative conformal supergravity arising in the original twistor string models of Witten and of Berkovits. After reviewing elements of twistor theory and of the world-sheet formulation of the Berkovits model, I will describe the symmetries of the so-called beta-gamma systems and their gauging. I will then explain how the analysis can be applied to the construction of a family of new gauged Berkovits twistor strings which are free from world-sheet anomalies. The new theories include one with the spectrum of N=8 supergravity, two theories with the spectrum of N=4 supergravity coupled to N=4 Yang-Mills, a family of N>0 models with the spectra of self-dual supergravity coupled to self-dual super-Yang-Mills, and a non-supersymmetric string with the spectrum of self-dual gravity coupled to self-dual Yang-Mills and a scalar. Time permitting, I will discuss what is known about the interactions in the new theories.