AdS3 Pure Gravity and Stringy Unitarity
Abstract
We construct a unitary, modular-invariant torus partition function of a two-dimensional conformal field theory with a Virasoro primary spectral gap of * = c-112 above the vacuum. The twist gap is identical, apart from two states O* with spin scaling linearly in the central charge c. These states admit an AdS3 interpretation as strongly coupled strings. All other states are black hole microstates.
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