$nπ$ phase ambiguity of cosmic birefringence
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916296931672064 |
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| author | Naokawa, Fumihiro Namikawa, Toshiya Murai, Kai Obata, Ippei Kamada, Kohei |
| author_facet | Naokawa, Fumihiro Namikawa, Toshiya Murai, Kai Obata, Ippei Kamada, Kohei |
| contents | We point out that the rotation angle $β$ of cosmic birefringence, which is a recently reported parity-violating signal in the cosmic microwave background (CMB), has a phase ambiguity of $nπ\,(n\in\mathbb{Z})$. This ambiguity has a significant impact on the interpretation of the origin of cosmic birefringence. Assuming an axion-like particle as the origin of cosmic birefringence, this ambiguity can be partly broken by the anisotropic cosmic birefringence and the shape of the CMB angular power spectra. We also discuss constraints on $β$ from existing experimental results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_15538 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $nπ$ phase ambiguity of cosmic birefringence Naokawa, Fumihiro Namikawa, Toshiya Murai, Kai Obata, Ippei Kamada, Kohei Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology We point out that the rotation angle $β$ of cosmic birefringence, which is a recently reported parity-violating signal in the cosmic microwave background (CMB), has a phase ambiguity of $nπ\,(n\in\mathbb{Z})$. This ambiguity has a significant impact on the interpretation of the origin of cosmic birefringence. Assuming an axion-like particle as the origin of cosmic birefringence, this ambiguity can be partly broken by the anisotropic cosmic birefringence and the shape of the CMB angular power spectra. We also discuss constraints on $β$ from existing experimental results. |
| title | $nπ$ phase ambiguity of cosmic birefringence |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2405.15538 |