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The Hartle-Hawking-Israel state on stationary black hole spacetimes

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arxiv 1806.07645 v2 pith:YQTJHCL4 submitted 2018-06-20 math-ph math.APmath.MP

classification math-phmath.APmath.MP
keywords statespacetimeblackholestationaryhadamardhartle-hawking-israelkilling
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We consider a free quantized Klein-Gordon field in a spacetime (M, g) containing a stationary black hole, more precisely a spacetime with a stationary bifurcate Killing horizon in the sense of Kay and Wald. We prove the existence of the Hartle-Hawking-Israel ground state, which is a pure state on the whole spacetime whose restriction to the exterior of the black hole is a thermal state at Hawking temperature.We show that the HHI state is a Hadamard state and is the unique Hadamard extension of the above thermal state to the whole spacetime. We construct the HHI state by Wick rotation in Killing time coordinates, using the notion of the Calderon projector for elliptic boundary value problems.

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Cited by 2 Pith papers

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    quant-ph 2025-07 conditional novelty 6.0 of 10

    A rigorous construction of P(phi)_2 QFT on curved Riemannian surfaces satisfying Segal's axioms, plus a geometric rederivation of the Cardy-Calabrese entanglement entropy and new zeta determinant asymptotics.

  2. Correction to: The Double-Wedge Algebra for Quantum Fields on Schwarzschild and Minkowski Spacetimes

    math-ph 2025-06 accept novelty 3.0 of 10

    A 1985 proof error is identified and fixed by replacing an invalid inference with the fact that the one-particle Hamiltonian has no eigenvectors.

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