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Thursday, February 19th 2015

12:15 pm:

In recent years, there has been much progress in understanding the ultraviolet properties of supergravity amplitudes. Through symmetry arguments and direct computations, supergravity has been found to be much tamer in the ultraviolet than previously thought. In this talk, I will discuss a new type of cancellation known as enhanced cancellation that renders a supergravity amplitude finite. Such cancellations cannot be understood through any symmetry argument based on a local covariant diagrammatic formalism. I will provide several examples where we observe enhanced cancellations, showing finiteness in supergravity amplitudes where naively divergence was expected. Understanding these enhanced cancellations through a means other than direct computation remains an open problem.

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