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  • Letter
  • Open Access

Isotropic cosmic birefringence from early dark energy

Kai Murai1,2, Fumihiro Naokawa3,4, Toshiya Namikawa2, and Eiichiro Komatsu5,2

  • 1ICRR, The University of Tokyo, Kashiwa, 277-8582, Japan
  • 2Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, 277-8583, Japan
  • 3Department of Physics, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 4Research Center for the Early Universe, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 5Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany

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Phys. Rev. D 107, L041302 – Published 21 February, 2023

DOI: https://doi.org/10.1103/PhysRevD.107.L041302

Abstract

A tantalizing hint of isotropic cosmic birefringence has been found in the EB cross-power spectrum of the cosmic microwave background (CMB) polarization data with a statistical significance of 3σ. A pseudoscalar field coupled to the CMB photons via the Chern-Simons term can explain this observation. The same field may also be responsible for early dark energy (EDE), which alleviates the so-called Hubble tension. Since the EDE field evolves significantly during the recombination epoch, the conventional formula that relates EB to the difference between the E- and B-mode autopower spectra is no longer valid. Solving the Boltzmann equation for polarized photons and the dynamics of the EDE field consistently, we find that currently favored parameter space of the EDE model yields a variety of shapes of the EB spectrum, which can be tested by CMB experiments.

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Phys. Rev. D 107, L041302– Published 21 February, 2023
  • Received 16 September 2022
  • Accepted 25 January 2023
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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. Open access publication funded by the Max Planck Society.

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