Forthcoming events in this series


Fri, 04 Jun 2010

11:30 - 12:30
Gibson 1st Floor SR

T-duality in AdS$_5$

Ron Reid-Edwards
(Oxford)
Abstract

This will discuss the paper of Ricci, Tseytlin & Wolf from 2007.

Fri, 21 May 2010

12:00 - 13:00
Gibson 1st Floor SR

Hopf Algebras and BCFW recursion after Kreimer

Tim Adamo
(Oxford)
Abstract

Abstract: We will review Kreimer's construction of a Hopf algebra for Feynman graphs, and explore several aspects of this structure including its relationship with renormalization and the (trivial) Hochschild cohomology of the algebra.  Although Kreimer's construction is heavily tied with the language of renormalization, we show that it leads naturally to recursion relations resembling the BCFW relations, which can be expressed using twistors in the case of N=4 super-Yang-Mills (where there are no ultra-violet divergences).  This could suggest that a similar Hopf algebra structure underlies the supersymmetric recursion relations...