Abstract
This contribution contains a review of the role of the three-sphere free energy F in recent developments related to the F-theorem and F-maximization. The F-theorem states that for any Lorentz-invariant RG trajectory connecting a conformal field theory CFT in the ultraviolet to a conformal field theory CFT, the F-coefficient decreases: . I provide many examples of CFTs where one can compute F, approximately or exactly, and discuss various checks of the F-theorem. F-maximization is the principle that in an SCFT, viewed as the deep IR limit of an RG trajectory preserving supersymmetry, the superconformal R-symmetry maximizes F within the set of all R-symmetries preserved by the RG trajectory. I review the derivation of this result and provide examples.
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More From: Journal of Physics A: Mathematical and Theoretical
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