A New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866915232737132544 |
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| author | Yin, Weichen Winston Dai, Liang Huang, Junwu Ji, Lingyuan Ferraro, Simone |
| author_facet | Yin, Weichen Winston Dai, Liang Huang, Junwu Ji, Lingyuan Ferraro, Simone |
| contents | We propose a novel statistical method to measure cosmic birefringence and demonstrate its power in probing parity violation due to axions. Exploiting an empirical correlation between the integrated radio polarization direction of a spiral galaxy and its apparent shape, we devise an unbiased minimum-variance estimator for the rotation angle, which should achieve an uncertainty of $5^\circ$--$ 15^\circ$ per galaxy. Large galaxy samples from the forthcoming SKA continuum surveys, together with optical shape catalogs, promise a comparable or even lower noise power spectrum for the rotation angle than in the CMB Stage-IV (CMB-S4) experiment, with different systematics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_18568 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes Yin, Weichen Winston Dai, Liang Huang, Junwu Ji, Lingyuan Ferraro, Simone Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology We propose a novel statistical method to measure cosmic birefringence and demonstrate its power in probing parity violation due to axions. Exploiting an empirical correlation between the integrated radio polarization direction of a spiral galaxy and its apparent shape, we devise an unbiased minimum-variance estimator for the rotation angle, which should achieve an uncertainty of $5^\circ$--$ 15^\circ$ per galaxy. Large galaxy samples from the forthcoming SKA continuum surveys, together with optical shape catalogs, promise a comparable or even lower noise power spectrum for the rotation angle than in the CMB Stage-IV (CMB-S4) experiment, with different systematics. |
| title | A New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2402.18568 |