Type IIB supergravity famously has a discrete duality group, which is an exact symmetry of the full type IIB string theory. This symmetry has potential quantum anomalies, which could render the theory inconsistent. In this talk I will describe how we computed these anomalies in recent work, which are controlled by a cobordism group, and show they are nonvanishing, but remarkably, they can be cancelled by a subtle modification of the IIB ChernSimons term in what amounts to a new variant of the GreenSchwarz mechanism. This only happens because of some cancellations that depend on the precise details of the IIB supergravity spectrum. I will also describe alternative ways to cancel this anomaly, presenting variant versions of IIB string theory which have the same IIB supergravity as the lowenergy limit, but which differ at the nonperturbative level. These theories may or may not be in the Swampland.
MathPhysics Joint Seminar
Tuesday, December 7, 2021  3:30pm
Miguel Montero
Harvard University
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