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SUMMARY:Automorphic String Amplitudes - Henrik Gustafsson -- Chalmers
DTSTART:20161103T130000Z
DTEND:20161103T140000Z
UID:TALK67790@talks.cam.ac.uk
CONTACT:Dr. Piotr Tourkine
DESCRIPTION:Automorphic forms arise naturally when studying scattering amp
 litudes in toroidal compactifications of string theory. In this talk\, I w
 ill summarize the conditions on four-graviton amplitudes from the literatu
 re required by U-duality\, supersymmetry and string perturbation theory\, 
 which are satisfied by certain Eisenstein series on exceptional Lie groups
 . Physical information\, such as instanton effects\, are encoded in their 
 Fourier coefficients on parabolic subgroups\, which are\, in general\, dif
 ficult to compute. I will demonstrate a method for evaluating certain Four
 ier coefficients of interest in string theory. Based on arXiv:1511.04265\,
  arXiv:1412.5625 and work in progress.\n
LOCATION:Potter Room (first floor\, Pav. B)
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