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Black holes and black hole thermodynamics without event horizons

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arxiv 0809.3850 v1 pith:YEWG3RIO submitted 2008-09-23 hep-th

classification hep-th
keywords horizonsblackeventdefinedholestrappingdiscusshole
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate whether black holes can be defined without using event horizons. In particular we focus on the thermodynamic properties of event horizons and the alternative, locally defined horizons. We discuss the assumptions and limitations of the proofs of the zeroth, first and second laws of black hole mechanics for both event horizons and trapping horizons. This leads to the possibility that black holes may be more usefully defined in terms of trapping horizons. We also show how Hawking radiation can also be seen to arise from trapping horizons and discuss which horizon area should be associated with the gravitational entropy.

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Cited by 2 Pith papers

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

  1. Doppler shifted Hawking radiation from acoustic black holes in ultra-relativistic heavy-ion collisions

    hep-ph 2025-09 conditional novelty 6.0 of 10

    Even when the central flow is boost invariant, large-rapidity deviations can slow the acoustic horizon's recession, giving finite redshift Hawking radiation that may affect momentum distributions.

  2. Dynamical black holes and accretion-induced backreaction

    gr-qc 2025-07 conditional novelty 4.0 of 10

    For accreting Reissner-Nordstrom black holes, the momentum flux from infalling matter splits an extremal horizon into two, while energy density displaces the extremal horizon's radius.

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