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Constraints on higher spin \(\mathrm{CFT}_{2}\). (English) Zbl 1391.83083

Summary: We derive constraints on two-dimensional conformal field theories with higher spin symmetry due to unitarity, modular invariance, and causality. We focus on CFTs with \( {\mathcal{W}}_N \) symmetry in the “irrational” regime, where \(c>N-1\) and the theories have an infinite number of higher-spin primaries. The most powerful constraints come from positivity of the Kac matrix, which (unlike the Virasoro case) is non-trivial even when \( c > N - 1\). This places a lower bound on the dimension of any non-vacuum higher-spin primary state, which is linear in the central charge. At large \(c\), this implies that the dual holographic theories of gravity in \(\mathrm{AdS}_{3}\), if they exist, have no local, perturbative degrees of freedom in the semi-classical limit.

MSC:

83D05 Relativistic gravitational theories other than Einstein’s, including asymmetric field theories
81T40 Two-dimensional field theories, conformal field theories, etc. in quantum mechanics
17B67 Kac-Moody (super)algebras; extended affine Lie algebras; toroidal Lie algebras

Software:

Mathematica

References:

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