Speaker
Mr
Tobias Hansen
(Universitaet Hamburg)
Description
Tree level unitarity relates the residues of N-point amplitudes of scalars to lower point amplitudes of all particles in the spectrum of a theory. I will explain in the case of open bosonic string theory how to exploit this relation, in which one has to sum over all particles that are on-shell at the residue in question and all its possible polarizations. In contrast to Yang-Mills theory, here the spectrum contains an infinite amount of massive states, which are irreducible tensor representations of the little group SO(D-1). Along the way, we will come across a simple way to derive the restrictions that the no-ghost theorem poses on the parameters $\alpha_0$ and D. This talk is based on work with Rutger Boels.
Primary author
Mr
Tobias Hansen
(Universitaet Hamburg)
