Can primordial parity violation explain the observed cosmic birefringence? [CEA]

http://arxiv.org/abs/2208.08101


Recently, the cross-correlation between $E$- and $B$-mode polarization of the cosmic microwave background (CMB), which is well explained by cosmic birefringence with rotation angle $\beta\approx 0.3$ deg, has been found in CMB polarization data. We carefully investigate the possibility of explaining the observed $EB$ correlation by the primordial chiral gravitational waves (CGWs), which can be generated in the parity-violating theories in the primordial Universe. We found that the CGWs scenario does not work due to the overproduction of the $BB$ auto-correlation which far exceeds the observed one by SPTPol and POLARBEAR.

Read this paper on arXiv…

T. Fujita, Y. Minami, M. Shiraishi, et. al.
Thu, 18 Aug 22
21/45

Comments: 5 pages, 2 figures