Large scale quantum entanglement in de Sitter spacetime

@article{Matsumura2017LargeSQ,
  title={Large scale quantum entanglement in de Sitter spacetime},
  author={Akira Matsumura and Yasusada Nambu},
  journal={Physical Review D},
  year={2017}
}
We investigate quantum entanglement between two symmetric spatial regions in de Sitter space with the Bunch-Davies vacuum. As a discretized model of the scalar field for numerical simulation, we consider a harmonic chain model. Using the coarse-grained variables for the scalar field, it is shown that the multipartite entanglement on the superhorizon scale exists by checking the monogamy relation for the negativity which quantifies the entanglement between the two regions. Further, we consider… 

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