Scattering amplitudes in strongly coupled N=4 SYM from semiclassical strings in AdS - High Energy Physics - TheoryReportar como inadecuado




Scattering amplitudes in strongly coupled N=4 SYM from semiclassical strings in AdS - High Energy Physics - Theory - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: Very recently in arXiv:0705.0303 Alday and Maldacena gave a string theoryprescription for computing (all) planar amplitudes in N=4 supersymmetric gaugetheory at strong coupling using the AdS-CFT correspondence. These amplitudesare determined by a classical string solution and contain a universalexponential factor involving the action of the classical string. On the gaugetheory side, expressions for perturbative amplitudes at strong coupling werepreviously proposed only for specific helicities of external particles - themaximally helicity violating or MHV amplitudes. These follow from theexponential ansatz of Bern, Dixon and Smirnov for MHV amplitudes in N=4 SYM. Inthis paper we examine the amplitudes dependence on helicities andparticle-types of external states. We consider the prefactor of stringamplitudes and give arguments suggesting that the prefactor at strong couplingshould be the same as the Yang-Mills tree-level amplitude for the same process.This implies that scattering amplitudes in N=4 SYM simplify dramatically in thestrong coupling limit. It follows from our proposal that in this limit all (MHVand non-MHV) n-point amplitudes are given by the (known) tree-level Yang-Millsresult times the helicity-independent (and particle-type-independent) universalexponential.



Autor: Steven Abel, Stefan Forste, Valentin V. Khoze

Fuente: https://arxiv.org/







Documentos relacionados