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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.

Maths HEP Lunchtime Seminars: On the perturbative structure of the S-matrix of massless particles

Presented by Paolo Benincasa, University of Durham

21 November 2008 13:00 in CM221

The analysis of the singularities in the S-matrix of particles has shown
that perturbative structure field theories can be much simpler than what
Feynman diagrams tell us. In particular, there exist classes of theories
whose perturbative S-matrix is completely determined by a sub-set of its
singularities. At tree level this reflect with the existence of recursion
relations. At loop level, there are special singularities, the leading
singularities, which are believed to determine a class of theories which
N=4 SYM and N=8 supergravity belongs to. I will discuss both the tree and
loop level, with a particular attention on the leading singularity
technique and its application to the investigation of the perturbative N=8
supergravity.

Contact pau.figueras@durham.ac.uk or charles.young@durham.ac.uk for more information