Forbidden singularities in heavy-light Virasoro blocks are shown to be the critical point of an instanton-gas phase transition via AGT, with critical fugacity equal to the known singularity location.
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Phase transition from eigenstate thermalization: forbidden singularity and instanton proliferation via AGT correspondence
Forbidden singularities in heavy-light Virasoro blocks are shown to be the critical point of an instanton-gas phase transition via AGT, with critical fugacity equal to the known singularity location.