Theory Seminar (High Energy/Cosmology)

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The Large Scale Structure of α' Effects in String Theory
Date: Wednesday, December 15th
Time: 1:00 pm - 2:00 pm
Place: Chamberlin 5280
Speaker: Andreas Schachner, University of Cambridge
Abstract: In this talk, I discuss three approaches to deriving and understanding α' effects in String Theory. I present preliminary results of a project on completing the ten-dimensional type II effective actions at higher order in string perturbation theory. In this context, I provide concrete evidence at the level of five-point superstring amplitudes that the kinematics in the maximally U(1)-violating sector is obtained from standard superspace integrals over sixteen fermionic coordinates. This is in line with 11D superparticle amplitudes in M-theory compactified on 2-tori where the well-known modular forms required for SL(2,Z) invariance of type IIB arise from integrating out winding modes on the torus.
Host: Lars Aalsma
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