We study the spin transport of light in weakly inhomogeneous axion field in a flat Robertson-Walker universe and derive the spin Hall effect for circularly polarized rays. Regarding primordial quantum fluctuations of the axion field in the de Sitter phase as the origin of the inhomogeneity, we show that the conformal invariance of the correlator determines the root-mean-square (r.m.s) fluctuation of the path of circularly polarized cosmic rays. We explain how the r.m.s fluctuation can be experimentally determined. (C) 2020 The Author(s). Published by Elsevier B.V.
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Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
Zhang, Yongliang
Shi, Lina
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Chinese Acad Sci, Inst Microelect, Key Lab Microelect Devices & Integrated Technol, Beijing 100029, Peoples R China
Jiangsu Natl Synerget Innovat Ctr Adv Mat, Beijing, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
Shi, Lina
Xie, Changqing
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Chinese Acad Sci, Inst Microelect, Key Lab Microelect Devices & Integrated Technol, Beijing 100029, Peoples R China
Jiangsu Natl Synerget Innovat Ctr Adv Mat, Beijing, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
机构:
Ajou Univ, Dept Phys, Suwon 16499, South KoreaAjou Univ, Dept Phys, Suwon 16499, South Korea
Zhang, Anwei
Rhim, Jun-Won
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Ajou Univ, Dept Phys, Suwon 16499, South Korea
Seoul Natl Univ, Res Ctr Novel Epitaxial Quantum Architectures, Dept Phys, Seoul 08826, South KoreaAjou Univ, Dept Phys, Suwon 16499, South Korea