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Seminar
FIELD Phys:StringTheory
DATE November 16 (Thu), 2017
TIME 12:00-13:00
PLACE 1423
SPEAKER Sarkis, Matthieu
HOST Sciarappa, Antonio
INSTITUTE Kias
TITLE One-loop BPS amplitudes in heterotic flux vacua
ABSTRACT We compute the new supersymmetric index of a large class of heterotic compactifications with torsion, corresponding to principal two-torus bundles over warped K3 surfaces
with H-flux. Starting from a UV description as a (0,2) gauged linear sigma-model with torsion, we use supersymmetric localization techniques to provide an explicit expression
of the index as a sum over the Jeffrey-Kirwan residues of the one-loop determinant. We then propose a geometrical formula that gives the new supersymmetric index in terms of bundle data, regardless of any particular choice of underlying two-dimensional theory. I may also briefly discuss some application to the computation of the one-loop
corrections to some BPS-saturated amplitudes.
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