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Abstract: This thesis is concerned with the study of scattering amplitudes infour-dimensional conformal field theories, more particularly the N=4super-Yang-Mills theory. We study this theory first at tree level by usingtwistor space techniques and review the twistor string models that wereproposed to describe it. Then, we turn to the issue of iteration relations andall loop ansatze for scattering amplitudes. We review the unitarity method forcomputing scattering amplitudes and discuss the Wilson loop-scatteringamplitude duality that was inspired by the strong-coupling prescription ofAlday and Maldacena for scattering amplitudes. We describe in some detail thecomputation of a two-loop six-point scattering amplitude and its surprisingequality to the polygonal Wilson loop.



Autor: C. Vergu

Fuente: https://arxiv.org/



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