Probing Anisotropic Cosmic Birefringence with Foreground-Marginalised SPT B-mode Likelihoods
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arXiv
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| Format: | Preprint |
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2025
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| author | Balkenhol, L. Coerver, A. Reichardt, C. L. Zebrowski, J. A. |
| author_facet | Balkenhol, L. Coerver, A. Reichardt, C. L. Zebrowski, J. A. |
| contents | In this work, we construct foreground-marginalised versions of the SPT-3G D1 and SPTpol cosmic microwave background (CMB) B-mode polarisation likelihoods. The compression is performed using the CMB-lite framework and we use the resulting data sets to constrain anisotropic cosmic birefringence, parametrised by the amplitude of a scale-invariant anisotropic birefringence spectrum, $A_{\rm CB}$. Using the new SPT-3G data we report a $95\%$ upper limit on $A_{\rm CB}$ of $ 1.2\times 10^{-4}$, which tightens to $0.53\times 10^{-4}$ when imposing a prior on the amplitude of gravitational lensing based on CMB lensing reconstruction analyses. These are the tightest constraints on anisotropic birefringence from BB power spectrum measurements to-date, demonstrating the constraining power of the South Pole Telescope. The likelihoods used in this work are made publicly available at https://github.com/lbalkenhol/candl_data |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_07928 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Anisotropic Cosmic Birefringence with Foreground-Marginalised SPT B-mode Likelihoods Balkenhol, L. Coerver, A. Reichardt, C. L. Zebrowski, J. A. Cosmology and Nongalactic Astrophysics In this work, we construct foreground-marginalised versions of the SPT-3G D1 and SPTpol cosmic microwave background (CMB) B-mode polarisation likelihoods. The compression is performed using the CMB-lite framework and we use the resulting data sets to constrain anisotropic cosmic birefringence, parametrised by the amplitude of a scale-invariant anisotropic birefringence spectrum, $A_{\rm CB}$. Using the new SPT-3G data we report a $95\%$ upper limit on $A_{\rm CB}$ of $ 1.2\times 10^{-4}$, which tightens to $0.53\times 10^{-4}$ when imposing a prior on the amplitude of gravitational lensing based on CMB lensing reconstruction analyses. These are the tightest constraints on anisotropic birefringence from BB power spectrum measurements to-date, demonstrating the constraining power of the South Pole Telescope. The likelihoods used in this work are made publicly available at https://github.com/lbalkenhol/candl_data |
| title | Probing Anisotropic Cosmic Birefringence with Foreground-Marginalised SPT B-mode Likelihoods |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.07928 |