Seminar detail: Kilobyte cosmic birefringence and ALP domain walls without strings

Date&Time	Mon Apr 19 2021 (13:30 - 14:30)
Speaker	Wen Yin
Affiliation	Tohoku Univ.
Title	Kilobyte cosmic birefringence and ALP domain walls without strings
Abstract	ALP domain walls without strings may be formed in the early Universe. I discuss the mechanisms of the domain wall formation and show the implication on the birefringence of cosmic microwave background (CMB) polarization. For domain walls following the scaling solution, both isotropic and anisotropic cosmic birefringence are predicted. The prediction is insensitive to the model parameter choice. Surprisingly, the magnitude of the isotropic birefringence can explain the recently reported value, while the anisotropic one is also consistent with the observation. The detection of both signals will be a smoking-gun evidence for the scenario.
Remarks
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