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The Unruh vacuum and the in-vacuum in the Reissner-Nordstr\"om spacetime

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arxiv 2311.09943 v3 pith:KOGEUPCZ submitted 2023-11-16 gr-qc hep-th

classification gr-qchep-th
keywords blackholequantumin-vacuumreissner-nordstrspacetimestateunruh
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The Unruh vacuum is widely used as quantum state to describe black hole evaporation since near the horizon it reproduces the physical state of a quantum field, the so called in-vacuum, in the case the black hole is formed by gravitational collapse. We examine the relation between these two quantum states in the background spacetime of a Reissner-Nordstr\"om black hole (both extremal and not) highlighting similarities and striking differences.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Semiclassical regularity of compact trapped regions: From dynamical horizons to inner extremality

    gr-qc 2026-07 conditional novelty 7.0 of 10

    In finite-lifetime dynamical geometries the in-vacuum RSET stays finite at the inner horizon, growing exponentially for non-extremal cases but only as a power law for inner-extremal ones.

  2. Semiclassical Black Hole-White Hole transitions: an analytical treatment

    gr-qc 2026-08 conditional novelty 6.0 of 10

    The |in>-vacuum stress-energy in 2D collapse models amplifies at the inner horizon and can flip the ingoing null expansion, turning a trapped region into an anti-trapped one.

  3. Violations of the null convergence condition in kinematical transitions between singular and regular black holes, horizonless compact objects, and bounces

    gr-qc 2025-02 conditional novelty 6.0 of 10

    During kinematical transitions between singular and regular black holes, horizonless compact objects, and bounces, the null convergence condition is violated even when both endpoint spacetimes respect it.

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