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In theories with gravity duals Lorentzian correlators exhibit surprising singularities. These serve as the field-theoretic representation of the emergent bulk causal structure. In this talk we describe the singularity structure of the thermal two-point function which captures the causal structure of its dual black hole geometry. We explain how these singularities can be computed in the gravity approximation and discuss the effects of stringy corrections on the singular behavior. We argue that detecting traces of black hole bulk-cone singularities in future simulations of holographic systems can be likened to the black hole images recently captured by the Event Horizon Telescope.
Based on an ongoing work with M. Dodelson, C. Iossa, R. Karlsson, A. Lupsasca