منابع مشابه
Loops in Twistor Space
We elucidate the one-loop twistor-space structure corresponding to momentum-space MHV diagrams. We also discuss the infrared divergences, and argue that only a limited set of MHV diagrams contain them. We show how to introduce a twistor-space regulator corresponding to dimensional regularization for the infrared-divergent diagrams. We also evaluate explicitly the ‘holomorphic anomaly’ pointed o...
متن کاملPerturbative Gravity and Twistor Space
Tree amplitudes in gravity theories can be computed from those of gauge theory using the KLT relations [1]. Inspired by this observation, investigations [2,3,4,5] have been carried out in the hope of discovering a deeper connection at the perturbative level between N = 8 supergravity [6] and N = 4 super Yang-Mills. A link between these theories, beyond structural similarities like the non-abeli...
متن کاملParity Invariance For Strings In Twistor Space
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, which is obvious in the standard formalism, is highly unclear from this point of view. Here we prove that tree diagrams computed from connected D-instanton configurations are paritysymmetric. The main point in the proof a...
متن کاملSupersymmetric Gauge Theories in Twistor Space
We construct a twistor space action for N = 4 super Yang-Mills theory and show that it is equivalent to its four dimensional spacetime counterpart at the level of perturbation theory. We compare our partition function to the original twistor-string proposal, showing that although our theory is closely related to string theory, it is free from conformal supergravity. We also provide twistor acti...
متن کاملTwistor Space, Minkowski Space and the Conformal Group
The theory of twistors, developed by Penrose’,2,3) gives an alternative geometry of Minkowski space. It is therefore remarkable that the symmetry group of compactified Minkowski space, the conformal group C, is different from the symmetry group of twistor space, which is SU(2,2). The relation between these two groups is that SU(2,2) is 4: 1 homomorphic to C,, the identity-connected component of...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2010
ISSN: 1029-8479
DOI: 10.1007/jhep03(2010)110