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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

CPT Student Seminar: The CHY formalism for massless scattering

Presented by Giuseppe De Laurentis, Durham University

13 February 2017 17:00 in OC218

The Cachazo-He-Yuan (CHY) formalism is a 2d CFT (string theory) which allows the
computation of scattering amplitudes. It is equivalent to, and at the same time fundamentally different from, the perturbative treatment of quantum field theory using Feynman diagrams (up to tree-level). It deals in particular with the scattering of n massless particles in an arbitrary D-dimensional flat space-time. This is achieved by a map from momentum space to the Riemann sphere with punctures. Starting from this map, I will discuss the so-called Scattering Equations, the proof for their polynomial form by Dolan and Goddard, and their general solution in terms of the determinant of a (n−3)!×(n−3)! matrix. Finally, I will discuss of how the scattering amplitudes can be obtained.

Contact Daniel Martin for more information

A gathering of mathematicians from the CPT group with physicists from IPPP, we meet to discuss our work in a relaxed and friendly environment.

An archive of previous years talks is kept here.