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astro-ph.CO2024
Constraining Ultralight ALP Dark Matter in Light of Cosmic Birefringence
Dongdong Zhang, Elisa G. M. Ferreira, Ippei Obata +1
Cosmic birefringence, the observed rotation of the polarization plane of the cosmic microwave background (CMB), serves as a compelling probe for parity-violating physics beyond the…
astro-ph.CO2024
phase ambiguity of cosmic birefringence
Fumihiro Naokawa, Toshiya Namikawa, Kai Murai +2
We point out that the rotation angle of cosmic birefringence, which is a recently reported parity-violating signal in the cosmic microwave background (CMB), has a phase ambigui…