This seminar will be presented **in-person in Wolfensohn Hall at the IAS and on Zoom.**

For contact-tracing purposes **all attendees must register for this seminar: **

REGISTRATION FORM

All in-person attendees must be fully vaccinated and **masks are required** in all indoor spaces (except while actively eating). Additionally, **all off-campus attendees are required to upload proof of vaccination via the IAS CrowdPass App **.

Abstract: 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, and show they are nonvanishing, but remarkably, they can be cancelled by a subtle modification of the IIB Chern-Simons term in what amounts to a new variant of the Green-Schwarz 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 low-energy limit, but which differ at the nonperturbative level. These theories may or may not be in the Swampland.