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Cosmic decoherence: massive fields

Liu, Junyu and Sou, Chon-Man and Wang, Yi (2016) Cosmic decoherence: massive fields. Journal of High Energy Physics, 2016 (10). Art. No. 072. ISSN 1029-8479. doi:10.1007/JHEP10(2016)072.

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We study the decoherence of massive fields during inflation based on the Zurek’s density matrix approach. With the cubic interaction between inflaton and massive fields, the reduced density matrix for the massive fields can be calculated in the Schrödinger picture which is related to the variance of the non-Gaussian exponent in the wave functional. The decoherence rate is computed in the one-loop form from functional integration. For heavy fields with m≳O(H), quantum fluctuations will easily stay in the quantum state and decoherence is unlikely. While for light fields with mass smaller than O(H), quantum fluctuations are easily decohered within 5 ∼ 10 e-folds after Hubble crossing. Thus heavy fields can play a key role in studying problems involving inflationary quantum information.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Liu, Junyu0000-0003-1669-8039
Wang, Yi0000-0002-4174-8790
Additional Information:© 2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Received: 08 September 2016; Accepted: 05 October 2016; First Online: 14 October 2016. We thank Hongliang Jiang for his initial collaboration on this topic. We thank Rong-Xin Miao, Elliot Nelson, Bo Ning, Dong-Gang Wang, Zhong-Zhi Xianyu and Yehao Zhou for useful discussions. JL is grateful for PhD assistantships from the departments of physics of Caltech, and warm hosting from department of physics of Hong Kong University of Science and Technology during writing his bachelor's thesis. YW is supported by Grant HKUST4/CRF/13G and ECS 26300316 issued by the Research Grants Council (RGC) of Hong Kong.
Funding AgencyGrant Number
Research Grants Council of Hong KongHKUST4/CRF/13G
Research Grants Council of Hong KongECS 26300316
Subject Keywords:Cosmology of Theories beyond the SM; Models of Quantum Gravity
Issue or Number:10
Record Number:CaltechAUTHORS:20161109-090531798
Persistent URL:
Official Citation:Liu, J., Sou, CM. & Wang, Y. J. High Energ. Phys. (2016) 2016: 72. doi:10.1007/JHEP10(2016)072
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71870
Deposited By: Tony Diaz
Deposited On:09 Nov 2016 17:34
Last Modified:11 Nov 2021 04:52

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