Entangled Quantum Fields near the Event Horizon and Entropy

TL;DR

This paper explores quantum entanglement near black hole horizons, demonstrating how the nonunitarity of vacuum mappings enhances entanglement robustness and calculating the associated entropy.

Contribution

It introduces a novel analysis of entanglement using unitarily inequivalent quantum field representations in curved spacetime.

Findings

Entanglement between inner and outer particles is significant near the event horizon.

Nonunitarity of vacuum mappings increases entanglement robustness.

Computed entanglement entropy shows strong dependence on spacetime curvature.

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.