Entanglement dynamics in de Sitter spacetime

Shingo Kukita, Yasusada Nambu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We apply a master equation approximation with dynamical coarse graining to a pair of detectors interacting with a scalar field. By solving the master equation numerically, we investigate the evolution of negativity between comoving detectors in de Sitter space. For a massless conformal scalar field with conformal vacuum, it is found that a pair of detectors can perceive entanglement beyond the Hubble horizon scale if the initial separation of detectors is sufficiently small. At the same time, violation of the Bell-Clauser-Horne-Shimony-Holt inequality on the super-horizon scale is also detected. For a massless minimal scalar field with Bunch-Davies vacuum, on the other hand, the entanglement decays within Hubble time scale, owing to the quantum noise caused by particle creations in de Sitter space, and the entanglement on the super-horizon scale cannot be detected.

Original languageEnglish
Article number235010
JournalClassical and Quantum Gravity
Issue number23
Publication statusPublished - Nov 10 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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