Discussion Meeting
Sujay Ashok, Suvrat Raju and Aninda Sinha
24 September 2012 to 28 September 2012
ICTS-TIFR, IISc Campus, Bangalore

Scattering amplitudes play a pivotal role in quantum field theory as they are used to extract experimental predictions from theory. In order to explain the experimental data from the Large Hadron Collider (Cern), for instance, it is crucial to set up efficient ways to compute scattering cross-sections which then serve as a cross-check on the existing standard model of particle physics. There has been some remarkable work over the past few years that has improved both our understanding as well as our ability to calculate scattering amplitudes in gauge theories and, more recently, in gravity theories. These have led to a new perspective on scattering amplitudes in which underlying symmetries play a central role in solving for the amplitudes while conventional starting points - such as the Lagrangian - emerge as derived or secondary concepts. The most impressive results have been obtained for supersymmetric gauge theories, for which analytic computations are available for tree and many loop amplitudes. Remarkably various relations have also emerged between gravity and gauge theory scattering amplitudes, which suggests a unification between these theories.

The analytic progress on scattering amplitudes has been made possible due to the strong interaction between high energy physics, mathematics and string theory. This is a rapidly expanding area of research and includes wide ranging concepts such as holography, integrability, twistors, the  mathematics of Grassmannians and more. The aim of the workshop is to consolidate the most recent advances by bringing together young researchers who are experts in the various sub-fields and to stimulate interaction and collaboration among them, hoping to inspire further advances in the field.

program  ictsresin