Classical and quantum correlations of scalar field in the inflationary universe

Yasusada Nambu and Yuji Ohsumi
Phys. Rev. D 84, 044028 – Published 8 August 2011

Abstract

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 the super horizon scale. These behaviors support the appearance of the classical nature of the quantum fluctuation generated during the inflationary era.

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  • Received 26 May 2011

DOI:https://doi.org/10.1103/PhysRevD.84.044028

© 2011 American Physical Society

Authors & Affiliations

Yasusada Nambu* and Yuji Ohsumi

  • Department of Physics, Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan

  • *nambu@gravity.phys.nagoya-u.ac.jp
  • osumi@gravity.phys.nagoya-u.ac.jp

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Issue

Vol. 84, Iss. 4 — 15 August 2011

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