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Entanglement first law for timelike entanglement entropy and linearized Einstein's equation

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arxiv 2511.17098 v2 pith:YDYPO4WV submitted 2025-11-21 hep-th gr-qc

Entanglement first law for timelike entanglement entropy and linearized Einstein's equation

classification hep-th gr-qc
keywords entanglementfirsttimelikelinearizedeinsteinentropyequationsresult
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We extend the entanglement first law of conformal field theory (CFT) to timelike subregions. Focusing on intervals along the time direction of the boundary CFT, we show that the associated timelike entanglement entropy obeys a first-law-like relation, with an effective entanglement temperature inversely proportional to the temporal size of the interval. By implementing a double Wick rotation, we obtain the exact modular Hamiltonian for a suitable hyperbolic subsystem and use it to formulate the timelike entanglement first law precisely. Our central result is a detailed proof that, in asymptotically Anti-de Sitter spacetime, this timelike entanglement first law is equivalent to linearized Einstein's equations in the bulk: the first law follows from the linearized equations and, conversely, implies them. Our result further reveal the dynamical connections between entanglement and gravity.

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Cited by 5 Pith papers

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

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  2. Timelike Entanglement First Law and Linearized Field Equations in Higher Curvature Gravity

    hep-th 2026-07 unverdicted novelty 6.0

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