Comments on scaling limits of 4d N=2 theories

Davide Gaiotto; Nathan Seiberg; Yuji Tachikawa

Comments on scaling limits of 4d N=2 theories

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arxiv 1011.4568 v1 pith:EOP2U2E6 submitted 2010-11-20 hep-th

Comments on scaling limits of 4d N=2 theories

Davide Gaiotto , Nathan Seiberg , Yuji Tachikawa This is my paper

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We revisit the study of the maximally singular point in the Coulomb branch of 4d N=2 SU(N) gauge theory with N_f=2n flavors for N_f<2N. When n >= 2, we find that the low-energy physics is described by two non-trivial superconformal field theories coupled to a magnetic SU(2) gauge group which is infrared free. (In the special case n=2, one of these theories is a theory of free hypermultiplets.) This observation removes a possible counter example to a conjectured a-theorem.

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