Entanglement Structure in Expanding Universes

Yasusada Nambu

Entanglement Structure in Expanding Universes

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arxiv 1305.4193 v1 pith:DLKPWH2L submitted 2013-05-17 gr-qc quant-ph

Yasusada Nambu This is my paper

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We investigate entanglement of a quantum field in de Sitter spacetime using a particle detector model. By considering the entanglement between two comoving detectors interacting with a scalar field, it is possible to detect the entanglement of the scalar field by swapping it to detectors. For the massless minimal scalar field, we find that the entanglement between the detectors cannot be detected when their physical separation exceeds the Hubble horizon scale. This behavior supports the appearance of the classical nature of quantum fluctuations generated during the inflationary era.

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