Hartle-Hawking state is a maximum of entanglement entropy

Abstract

It is shown that the Hartle-Hawking state of a scalar field is a maximum of entanglement entropy in the space of pure quantum states satisfying the condition that backreaction is finite. In other words, the Hartle-Hawking state is a curved-space analogue of the EPR state, which is also a maximum of entanglement entropy.

Latex, 4 pages, Some comments are added on the "small backreaction condition"

References in corpus (1)

• Entanglement/Brick-wall entropies correspondence

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