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Gauge Theory Amplitudes In Twistor Space And Holomorphic Anomaly
Freddy Cachazo, Peter Svrcek, Edward Witten
We show that, in analyzing differential equations obeyed by one-loop gauge theory amplitudes, one must take into account a certain holomorphic anomaly. When this is done, the resul…
New Instanton Effects In Supersymmetric QCD
Chris Beasley, Edward Witten
In supersymmetric QCD with SU(N_c) gauge group and N_f flavors, it is known that instantons generate a superpotential if N_f=N_c-1 and deform the moduli space of vacua if N_f=N_c.…
Conformal Supergravity in Twistor-String Theory
Nathan Berkovits, Edward Witten
Conformal supergravity arises in presently known formulations of twistor-string theory either via closed strings or via gauge-singlet open strings. We explore this sector of twisto…
Twistor Space Structure Of One-Loop Amplitudes In Gauge Theory
Freddy Cachazo, Peter Svrcek, Edward Witten
We analyze the twistor space structure of certain one-loop amplitudes in gauge theory. For some amplitudes, we find decompositions that make the twistor structure manifest; for oth…
Parity Invariance For Strings In Twistor Space
Edward Witten
Topological string theory with twistor space as the target makes visible some otherwise difficult to see properties of perturbative Yang-Mills theory. But left-right symmetry, whic…
MHV Vertices And Tree Amplitudes In Gauge Theory
Freddy Cachazo, Peter Svrcek, Edward Witten
As an alternative to the usual Feynman graphs, tree amplitudes in Yang-Mills theory can be constructed from tree graphs in which the vertices are tree level MHV scattering amplitud…