@article{054f610331ee46558dd2e521406b007d,
title = "Can primordial parity violation explain the observed cosmic birefringence?",
abstract = "Recently, the cross-correlation between E- and B-mode polarization of the cosmic microwave background, which is well explained by cosmic birefringence with rotation angle β≈0.3 deg, has been found in cosmic microwave background polarization data. We carefully investigate the possibility of explaining the observed EB correlation by the primordial chiral gravitational waves, which can be generated in the parity-violating theories in the primordial Universe. We found that the chiral gravitational wave scenario does not work due to the overproduction of the BB autocorrelation, which far exceeds the observed one by SPTPol and POLARBEAR.",
author = "Tomohiro Fujita and Yuto Minami and Maresuke Shiraishi and Shuichiro Yokoyama",
note = "Funding Information: This work was supported in part by Japan Society for the Promotion of Science (JSPS) KAKENHI, Grants No. JP18K13537 (T. F.), No. JP20H05854 (T. F.), No. JP20H01932 (S. Y.), No. JP20K03968 (S. Y.), No. JP20K14497 (Y. M.), No. JP19K14718 (M. S.), and No. JP20H05859 (M. S.). The authors thank the Yukawa Institute for Theoretical Physics at Kyoto University. Discussions during the YITP workshop YITP-T-21-08 on “Upcoming CMB observations and Cosmology” were useful to complete this work. The authors are grateful to Yuji Chinone for suggestions on the plots of power spectra. M. S. acknowledges the Center for Computational Astrophysics, National Astronomical Observatory of Japan, for providing the computing resources of Cray XC50. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",
year = "2022",
month = nov,
day = "15",
doi = "10.1103/PhysRevD.106.103529",
language = "English",
volume = "106",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "10",
}