Kernphysikalisches Kolloquium
Location: FIAS, Science Campus Riedberg, Ruth-Moufang-Str. 1, Lecture Room 100
Time: Friday, June 22, 2012, 2:30-3:30pm (plus 10min for discussion)
Contact: hees@fias.uni-frankfurt.de
Advances in Computing Scattering Amplitudes in Gauge and Gravity Theories
Mohab Abou Zeid (Universität Hannover)
Feynman diagram calculations are extremely complicated in general, however in recent years a number of theoretical developments has led to some alternative and very powerful computational techniques for tree- and loop-level scattering amplitudes in QCD, supersymmetric gauge theory, and (super)gravity. I will give an overview of these developments and briefly discuss some of the techniques, including Witten's twistor string conjecture, the Cachazo-Svrcek-Witten rules, the Britto-Cachazo-Feng-Witten recursion relations and the Bern-Dixon-Dunbar-Kosower unitary method. These developments have unraveled many surprising hidden structures and symmetries in gauge theory and gravity scattering amplitudes which I will review. I will also give examples of previously impossible explicit calculations which have been performed and which have very important applications to LHC physics, to our understanding of the relationship between gauge theory and gravity amplitudes and to the possible finiteness of certain supergravity theories.