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# Brian Wecht : Towards a c-theorem in Four Dimensions

Intuitively, renormalization group flow is irreversible, since one would expect the number of massless degrees of freedom of a theory to decrease as one goes to progressively larger distance scales. This has been proven rigorously in two dimensions (the "c-theorem"), but is otherwise an open problem. I will discuss recent efforts to prove an analogous theorem in four dimensions for supersymmetric theories, for which we can make exact statements not usually accessible in their non-supersymmetric counterparts.

**Category**: String Theory**Duration**: 01:15:35**Date**: November 18, 2004 at 2:45 PM**Views**: 22-
**Tags:**seminar, String Theory Seminar

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