Entangled Quantum Fields near the Event Horizon and Entropy
arXiv:hep-th/0204034 · doi:10.1016/j.aop.2003.08.006
Abstract
By fully exploiting the existence of the unitarily inequivalent representations of quantum fields, we exhibit the entanglement between inner and outer particles, with respect to the event horizon of a black hole. We compute the entanglement entropy and we find that the nonunitarity of the mapping, between the vacua in the flat and the curved frames, makes the entanglement very robust.
15 pages, RevTeX. Changes in the spirit of the paper. Rearranged title, abstract and conclusions. Published on Annals of Physics