Unitary Evaporation and AdS/CFT

Masamichi Miyaji, Senior Research Scientist at iTHEMS (then at Kyoto University), contributed the chapter “Unitary Evaporation and AdS/CFT” to the newly published volume The Black Hole Information Paradox (Springer, 2025). In this chapter, he explains how the AdS/CFT correspondence provides a framework for addressing the black hole information paradox. He reviews essential tools such as the Ryu–Takayanagi formula and entanglement wedge reconstruction, and shows how recent progress involving Euclidean wormholes and gravitational path integrals leads to a unitary description of black hole evaporation, while also discussing the conceptual challenges that remain.