String Study Group – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Events > 2007 > String Study Group

String Study Group

P. Vanhove (Saclay) presents 0802.0868 etc

A suprisingly better ultra-violet behaviour of multiloop amplitude in
(super)gravity is expected based on extra cancellations of loop momenta
that have been linked in Bern et al. [arXiv:0707.1035]  to the  good
high-energy behaviour of tree level gravity amplitudes. In this talk we will
discuss the arguments of Bjerrum-Bohr et al. [0802.0868] where at one-loop
order  such cancellations  amplitude have been linked to diffeomorphism
invariances and the summations other the ordering of external leg in colorless
theories. We will  comment as well on the tree-level  analysis of
Arkani-hamed et al.  [0801.2385].