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Construction of the Unruh State for a Real Scalar Field on the Kerr-de Sitter Spacetime

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arxiv 2206.05073 v2 pith:G52LXOL2 submitted 2022-06-10 gr-qc math-phmath.MP

Construction of the Unruh State for a Real Scalar Field on the Kerr-de Sitter Spacetime

classification gr-qc math-phmath.MP
keywords stateblackholescalarspacetimesfieldfreehadamard
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The study of physical effects of quatum fields in black hole spacetimes, which is related to questions such as the validity of the strong cosmic censorship conjecture, requires a Hadamard state describing the physical situation. Here, we consider the theory of a free scalar field on a Kerr-de Sitter spacetime, focussing on spacetimes with sufficiently small angular momentum of the black hole and sufficiently small cosmological constant. We demonstrate that an extension of the Unruh state, which describes the expected late-time behaviour in spherically symmetric gravitational collapse, can be rigorously constructed for the free scalar field on such Kerr-de Sitter spacetimes. In addition, we show that this extension of the Unruh state is a Hadamard state in the black hole exterior and in the black hole interior up to the inner horizon. This provides a physically motivated Hadamard state for the study of free scalar fields in rotating black hole spacetimes.

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Cited by 1 Pith paper

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  1. Uniqueness of null-local modular flow

    hep-th 2026-07 conditional novelty 7.0

    For the free massless scalar in a Minkowski causal diamond, the vacuum is the unique state or weight in the vacuum sector whose modular flow is local on the null boundary.