Cosmic birefringence by dark photon
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.
Authors
- Dong‐Won Jung (ORCID: https://orcid.org/0000-0002-6675-4302)
- Donghui Jeong (ORCID: https://orcid.org/0000-0002-8434-979X)
- Jinn-Ouk Gong
- Dong‐Woo Kang (ORCID: https://orcid.org/0000-0003-2292-1946)
- Sung Mook Lee (ORCID: https://orcid.org/0000-0002-9519-0470)
- Seong Chan Park (ORCID: https://orcid.org/0000-0003-0176-4355)
Institutions
- Chonnam National University (KR)
- Korea Institute for Advanced Study (KR)
- Pennsylvania State University (US)
- Ewha Womans University (KR)
- Korea Advanced Institute of Science and Technology (KR)
- Yonsei University (KR)
- Asia Pacific Center for Theoretical Physics (KR)
- Institute for Basic Science (KR)
- European Organization for Nuclear Research (CH)
Publication Details
- Journal
- Journal of Cosmology and Astroparticle Physics
- Published
- 2024-08-01
- DOI
- https://doi.org/10.1088/1475-7516/2024/08/037
- Citations
- 1
- Primary Topic
- Dark Matter and Cosmic Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.66
Funders
- CERN
- National Research Foundation
- Yonsei University
- Ewha Womans University
- National Research Foundation of Korea
- Japan Society for the Promotion of Science