Publication : t08/120

Twistors, strings and supersymmetric gauge theories

Vergu C. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
This thesis is concerned with the study of scattering amplitudes in four-dimensional conformal field theories, more particularly the N=4 super-Yang-Mills theory. We study this theory first at tree level by using twistor space techniques and review the twistor string models that were proposed to describe it. Then, we turn to the issue of iteration relations and all loop ansatze for scattering amplitudes. We review the unitarity method for computing scattering amplitudes and discuss the Wilson loop--scattering amplitude duality that was inspired by the strong-coupling prescription of Alday and Maldacena for scattering amplitudes. We describe in some detail the computation of a two-loop six-point scattering amplitude and its surprising equality to the polygonal Wilson loop.
Année de publication : 2008
Soutenance de thèse : 2008-07-15
Preprint : arXiv:0809.1807
Keywords : conformal symmetry, higher loop computations, iteration relations twistors, scattering amplitudes, twistor strings
Langue : Anglais

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