Cosmic birefringence by dark photon

Sung Mook Lee, Dong Woo Kang, Jinn Ouk Gong, Donghui Jeong, Dong Won Jung, Seong Chan Park

Research output: Contribution to journalArticlepeer-review

Abstract

We study the kinetic mixing between the cosmic microwave background (CMB) photon and the birefringent dark photon. These birefringent dark photon may exist in parity-violating dark sector, for example, through the coupling to axion field. We show that the birefringence of the dark photon propagates to the CMB photon, but the resulting birefringence may not be isotropic over the sky, but will be anisotropic in general. Moreover, our investigation sheds light on the essential role played by kinetic mixing in the generation of two fundamental characteristics of the CMB: circular polarization and spectral distortion.

Original languageEnglish (US)
Article number037
JournalJournal of Cosmology and Astroparticle Physics
Volume2024
Issue number8
DOIs
StatePublished - Aug 1 2024

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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