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  • Letter
  • Open Access

Cosmic birefringence and electroweak axion dark energy

Gongjun Choi1,*, Weikang Lin1,†, Luca Visinelli1,2,‡, and Tsutomu T. Yanagida1,3,§

  • 1Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, C.P. 13, I-100044 Frascati, Italy
  • 3Kavli IPMU (WPI), UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

  • *gongjun.choi@hotmail.com
  • †weikanglin@sjtu.edu.cn
  • ‡luca.visinelli@sjtu.edu.cn
  • §tsutomu.tyanagida@sjtu.edu.cn
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Phys. Rev. D 104, L101302 – Published 29 November, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L101302

Abstract

Taking the recently reported nonzero rotation angle of the cosmic microwave background (CMB) linear polarization β=0.35±0.14  deg as the hint for a pseudo–Nambu-Goldstone boson quintessence dark energy (DE), we study the electroweak (EW) axion quintessence DE model where the axion mass is generated by the EW instantons. We find that the observed value of β implies a nontrivial U(1) electromagnetic anomaly coefficient (cγ), once the current constraint on the DE equation of state is also taken into account. With the aid of the hypothetical high energy structure of the model inspired by the experimentally inferred cγ, the model is shown to be able to make a prediction for the current equation of state (wDE,0) of the quintessence DE. This is expected to make our scenario distinguishable in comparison with the cosmological constant (w=−1) and testable in the future when the error in the future measurement of wDE,0 is reduced to O(1)% level (δw=O(10−2)).

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Phys. Rev. D 104, L101302– Published 29 November, 2021
  • Received 2 July 2021
  • Accepted 28 October 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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