Classical and Quantum Correlations of Scalar Field in the Inflationary Universe

Details Classical and Quantum Correlations of Scalar Field in the Inflationary Universe Classical and Quantum Correlations of Scalar Field in the Inflationary Universe

2011-05-26

arxiv.org/abs/1105.5212v2

Phys.Rev.D84:044028,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.044028

We investigate classical and quantum correlations of a quantum field in the inflationary universe using a particle detector model. By considering the entanglement and correlations between two comoving detectors interacting with a scalar field, we find that the entanglement between the detectors becomes zero after their physical separation exceeds the Hubble horizon. Furthermore, the quantum discord, which is defined as the quantum part of total correlation, approaches zero on super horizon scale. These behaviors support appearance of classical nature of the quantum fluctuation generated during the inflationary era.

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