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Entanglement and Expansion

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arxiv 2302.14666 v2 pith:AB3ZCWML submitted 2023-02-28 hep-th gr-qc

Konstantinos Boutivas , Georgios Pastras , Nikolaos Tetradis This is my paper · ORCID
classification hep-thgr-qc
keywords entanglemententropyfieldduringinflationmodesresultingscalar
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We study the entanglement entropy resulting from tracing out local degrees of freedom of a quantum scalar field in an expanding universe. It is known that when field modes become superhorizon during inflation they evolve to increasingly squeezed states. We argue that this causes the entanglement entropy to grow continuously as successive modes cross the horizon. The resulting entropy is proportional to the total duration of inflation. It is preserved during a subsequent radiation or matter dominated era, and thus it may be relevant for today's universe. We demonstrate explicitly these features in a toy model of a scalar field in 1+1 dimensions.

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  1. Boundary Conditions and Entanglement in Anti-de Sitter Space

    hep-th 2026-08 conditional novelty 6.0 of 10

    For a conformally coupled scalar in AdS4, the UV-divergent entanglement entropy is independent of boundary conditions, while the UV-finite part acquires a boundary-condition dependent R^2/a^2 correction with coefficie...

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