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Generalized Second Law for Cosmology

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arxiv 1510.02099 v1 pith:7WWNS7GZ submitted 2015-10-07 hep-th gr-qc

Raphael Bousso , Netta Engelhardt This is my paper · ORCID
classification hep-thgr-qc
keywords generalizedentropysecondalongconjecturecosmologyfuturepast
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We conjecture a novel Generalized Second Law that can be applied in cosmology, regardless of whether an event horizon is present: the generalized entropy increases monotonically outside of certain hypersurfaces we call past Q-screens. A past Q-screen is foliated by surfaces whose generalized entropy (sum of area and entanglement entropy) is stationary along one future null direction and increasing along the other. We prove that our Generalized Second Law holds in spacetimes obeying the Quantum Focussing Conjecture. An analogous law applies to future Q-screens, which appear inside evaporating black holes and in collapsing regions.

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Cited by 4 Pith papers

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

  1. Quantum Penrose Inequality

    hep-th 2019-08 conditional novelty 8.0 of 10

    A conjectured inequality, m ≥ sqrt(ℏ S_gen/(4πG)), replaces the surface area in the Penrose bound by the generalized entropy on a quantum lightsheet.

  2. Quantum Information Bound on the Energy

    hep-th 2019-09 conditional novelty 7.0 of 10

    A Quantum Penrose Inequality is conjectured, replacing trapped-surface area with lightsheet generalized entropy, and is tested against a semiclassical counterexample.

  3. Black hole thermodynamics at null infinity. Part 2: Open systems, Markovian dynamics and work extraction from non-rotating black holes

    hep-th 2026-01 conditional novelty 6.0 of 10

    Null-infinity black hole thermodynamics is recast as Markovian open-system thermodynamics, with chemical-potential terms identified as extractable work and used to formulate generalized grand-potential laws for Schwar...

  4. Jackiw-Teitelboim Model Coupled to Conformal Matter in the Semi-Classical Limit

    hep-th 2019-08 conditional novelty 6.0 of 10

    For JT gravity with conformal matter, the generalized entropy defined from the horizon dilaton plus matter entanglement is monotonic along the event horizon and along future Q-screens under the null energy condition, ...

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