Abstract
Abstract
We develop a technique for counting the number of stress tensor multiplets in a 4D $$ \mathcal{N} $$
N
= 2 SCFT. This provides a simple diagnostic for when an isolated (non-Lagrangian) SCFT is a product of two (or more) such theories. In class-S, the basic building blocks are the isolated SCFTs arising from the compactification of a 6D (2,0) theory on a 3-punctured sphere (“fixture”). We apply our technique to determine when a fixture is a product SCFT. The answer is that this phenomenon is surprisingly rare. In the low-rank AN−1, DN theories and the E6 theory studied by the first author and his collaborators, it occurs less than 1% of the time. Of the 2979 fixtures in the (untwisted and twisted) E6 theory, only 23 are product SCFTs. Of these, 22 were known to the original authors. The new one is a product of the (E7)8 Minahan-Nemeschansky theory and a new rank-2 SCFT.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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