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Complementarity Endures: No Firewall for an Infalling Observer

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arxiv 1207.6626 v4 pith:C7U63RZZ submitted 2012-07-27 hep-th gr-qc

Complementarity Endures: No Firewall for an Infalling Observer

classification hep-th gr-qc
keywords firewallobserverquantumclassicalcomplementarityhorizoninfallingparadox
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We argue that the complementarity picture, as interpreted as a reference frame change represented in quantum gravitational Hilbert space, does not suffer from the "firewall paradox" recently discussed by Almheiri, Marolf, Polchinski, and Sully. A quantum state described by a distant observer evolves unitarily, with the evolution law well approximated by semi-classical field equations in the region away from the (stretched) horizon. And yet, a classical infalling observer does not see a violation of the equivalence principle, and thus a firewall, at the horizon. The resolution of the paradox lies in careful considerations on how a (semi-)classical world arises in unitary quantum mechanics describing the whole universe/multiverse.

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Cited by 2 Pith papers

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

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    Replica wormhole geometries justify the replica trick computation of the Page curve in holographic black hole models and support entanglement wedge reconstruction via the Petz map.

  2. Falling through the horizon of a quantum black hole

    hep-th 2026-07 conditional novelty 6.5

    Gravitational dressing in JT gravity lets an infalling Unruh-DeWitt detector detect the horizon location and temperature locally, violating the equivalence principle without a firewall.