Entangled Quantum Fields near the Event Horizon and Entropy

摘要

By fully exploiting the existence of the unitarily inequivalentrepresentations of quantum fields, we exhibit the entanglement between innerand outer particles, with respect to the event horizon of a black hole. Wecompute the entanglement entropy and we find that the nonunitarity of themapping, between the vacua in the flat and the curved frames, makes theentanglement very robust.