Detection of isotropic cosmic birefringence and its implications for axion-like particles including dark energy

Tomohiro Fujita, Kai Murai, Hiromasa Nakatsuka, Shinji Tsujikawa

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the possibility that axion-like particles (ALPs) with various potentials account for the isotropic birefringence recently reported by analyzing the Planck 2018 polarization data. For the quadratic and cosine potentials, we obtain lower bounds on the mass, coupling constant to photon g, abundance and equation of state of the ALP to produce the observed birefringence. Especially when the ALP is responsible for dark energy, it is possible to probe the tiny deviation of dark energy equation of state from −1 through the cosmic birefringence. We also explore ALPs working as early dark energy (EDE), which alleviates the Hubble tension problem. Since the other parameters are limited by the EDE requirements, we narrow down the ALP-photon coupling to 1019 GeV1 . g . 1016 GeV1 for the decay constant f = Mpl. Therefore, the Hubble tension and the isotropic birefringence imply that g is typically the order of f1, which is a non-trivial coincidence.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2020 Nov 23

ASJC Scopus subject areas

  • General

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