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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.06812 |
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| _version_ | 1866914377477652480 |
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| author | Keck Collaboration Ade, P. A. R. Ahmed, Zeeshan Amiri, Mandana Barkats, Denis Thakur, Ritoban Basu Bischoff, Colin A. Beck, Dominic Bock, James J. Boenish, Hans Buza, Victor Cantrall, Brianna Cheshire IV, James R. Connors, Jake Cornelison, James Crumrine, Michael Cukierman, Ari Jozef Denison, Edward Duband, Lionel Echter, Michael Eiben, Miranda Elwood, Brodi D. Fatigoni, Sofia Filippini, Jeffrey P. Fortes, Antonio Gao, Min Giannakopoulos, Christos Goeckner-Wald, Neil Goldfinger, David C. Gratton, Stephen Grayson, James A. Greathouse, Annsley Grimes, Paul K. Hall, Grantland Halal, George Halpern, Mark Hand, Emma Harrison, Sam A. Henderson, Shawn Hoang, Thuong Hubmayr, Johannes Hui, Howard Irwin, Kent D. Kang, Jae Hwan Karkare, Kirit S. Kefeli, Sinan Kovac, J. M. Kuo, Chao-Lin Lasko, Kekoa Lau, King Lautzenhiser, Margaret Lennox, Amber Liu, Tongtian Mackey, Scott Maher, Nolan Megerian, Koko G. Minutolo, Lorenzo Moncelsi, Lorenzo Nakato, Yuka Nguyen, H. T. O'Brient, Roger Paine, Scott Patel, Anika Petroff, Matthew A. Polish, Anna R. Prouve, Thomas Pryke, Clement Reintsema, Carl D. Richter, Steffen Romand, Thibault Salatino, Maria Schillaci, Alessandro Schmitt, Benjamin Schwarz, Robert Sheehy, Chris D. Singari, Baibhav Soliman, Ahmed Germaine, Tyler St Steiger, Aaron Steinbach, Bryan Sudiwala, Rashmi Teply, Grant Thompson, Keith L. Tucker, Carole Turner, Anthony D. Vergès, Clara Vieregg, Abigail G. Wandui, Albert Weber, Alexis C. Willmert, Justin Wong, Chin Lin Wu, Wai Ling K. Yang, Hung-I Yu, Cyndia Zeng, Lingzhen Zhang, Cheng Zhang, Silvia |
| author_facet | Keck Collaboration Ade, P. A. R. Ahmed, Zeeshan Amiri, Mandana Barkats, Denis Thakur, Ritoban Basu Bischoff, Colin A. Beck, Dominic Bock, James J. Boenish, Hans Buza, Victor Cantrall, Brianna Cheshire IV, James R. Connors, Jake Cornelison, James Crumrine, Michael Cukierman, Ari Jozef Denison, Edward Duband, Lionel Echter, Michael Eiben, Miranda Elwood, Brodi D. Fatigoni, Sofia Filippini, Jeffrey P. Fortes, Antonio Gao, Min Giannakopoulos, Christos Goeckner-Wald, Neil Goldfinger, David C. Gratton, Stephen Grayson, James A. Greathouse, Annsley Grimes, Paul K. Hall, Grantland Halal, George Halpern, Mark Hand, Emma Harrison, Sam A. Henderson, Shawn Hoang, Thuong Hubmayr, Johannes Hui, Howard Irwin, Kent D. Kang, Jae Hwan Karkare, Kirit S. Kefeli, Sinan Kovac, J. M. Kuo, Chao-Lin Lasko, Kekoa Lau, King Lautzenhiser, Margaret Lennox, Amber Liu, Tongtian Mackey, Scott Maher, Nolan Megerian, Koko G. Minutolo, Lorenzo Moncelsi, Lorenzo Nakato, Yuka Nguyen, H. T. O'Brient, Roger Paine, Scott Patel, Anika Petroff, Matthew A. Polish, Anna R. Prouve, Thomas Pryke, Clement Reintsema, Carl D. Richter, Steffen Romand, Thibault Salatino, Maria Schillaci, Alessandro Schmitt, Benjamin Schwarz, Robert Sheehy, Chris D. Singari, Baibhav Soliman, Ahmed Germaine, Tyler St Steiger, Aaron Steinbach, Bryan Sudiwala, Rashmi Teply, Grant Thompson, Keith L. Tucker, Carole Turner, Anthony D. Vergès, Clara Vieregg, Abigail G. Wandui, Albert Weber, Alexis C. Willmert, Justin Wong, Chin Lin Wu, Wai Ling K. Yang, Hung-I Yu, Cyndia Zeng, Lingzhen Zhang, Cheng Zhang, Silvia |
| contents | We present the first constraints on multipole-dependent cosmic birefringence using CMB polarization data from the BK18 dataset, which combines observations from BICEP2, Keck Array, and BICEP3 at frequencies of 95, 150, and 220 GHz. Photon coupling to an axion-like field leads to the rotation of CMB polarization, inducing non-zero EB cross-correlations. We show that a multipole-dependent rotation beta(l) imprints a distinct signature in the polarization spectra that can be constrained. Specifically, we consider an Early Dark Energy (EDE) scenario in which a pseudoscalar field couples to photons through a Chern-Simons interaction, generating a polarization rotation with multipole dependence. We introduce a phenomenological beta(l) as a step function, obtaining constraints on the step function size consistent with zero, with uncertainties less than 0.15 degrees (68% CL). In addition, using multi-frequency EE, BB, and EB cross-spectra, along with robust BICEP/Keck foreground treatment and likelihood framework, we derive constraints on the axion-photon coupling amplitude g for several choices of EDE parameters. For the baseline best-fit value f_EDE = 0.087 from the Planck 2018 analysis, we obtain g = 0.11 +/- 0.37 (68% CL), consistent with previous limits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_06812 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | BICEP/Keck XXI: Constraints on Early-Universe Parity Violation from Multipole-Dependent Birefringence Keck Collaboration Ade, P. A. R. Ahmed, Zeeshan Amiri, Mandana Barkats, Denis Thakur, Ritoban Basu Bischoff, Colin A. Beck, Dominic Bock, James J. Boenish, Hans Buza, Victor Cantrall, Brianna Cheshire IV, James R. Connors, Jake Cornelison, James Crumrine, Michael Cukierman, Ari Jozef Denison, Edward Duband, Lionel Echter, Michael Eiben, Miranda Elwood, Brodi D. Fatigoni, Sofia Filippini, Jeffrey P. Fortes, Antonio Gao, Min Giannakopoulos, Christos Goeckner-Wald, Neil Goldfinger, David C. Gratton, Stephen Grayson, James A. Greathouse, Annsley Grimes, Paul K. Hall, Grantland Halal, George Halpern, Mark Hand, Emma Harrison, Sam A. Henderson, Shawn Hoang, Thuong Hubmayr, Johannes Hui, Howard Irwin, Kent D. Kang, Jae Hwan Karkare, Kirit S. Kefeli, Sinan Kovac, J. M. Kuo, Chao-Lin Lasko, Kekoa Lau, King Lautzenhiser, Margaret Lennox, Amber Liu, Tongtian Mackey, Scott Maher, Nolan Megerian, Koko G. Minutolo, Lorenzo Moncelsi, Lorenzo Nakato, Yuka Nguyen, H. T. O'Brient, Roger Paine, Scott Patel, Anika Petroff, Matthew A. Polish, Anna R. Prouve, Thomas Pryke, Clement Reintsema, Carl D. Richter, Steffen Romand, Thibault Salatino, Maria Schillaci, Alessandro Schmitt, Benjamin Schwarz, Robert Sheehy, Chris D. Singari, Baibhav Soliman, Ahmed Germaine, Tyler St Steiger, Aaron Steinbach, Bryan Sudiwala, Rashmi Teply, Grant Thompson, Keith L. Tucker, Carole Turner, Anthony D. Vergès, Clara Vieregg, Abigail G. Wandui, Albert Weber, Alexis C. Willmert, Justin Wong, Chin Lin Wu, Wai Ling K. Yang, Hung-I Yu, Cyndia Zeng, Lingzhen Zhang, Cheng Zhang, Silvia Cosmology and Nongalactic Astrophysics We present the first constraints on multipole-dependent cosmic birefringence using CMB polarization data from the BK18 dataset, which combines observations from BICEP2, Keck Array, and BICEP3 at frequencies of 95, 150, and 220 GHz. Photon coupling to an axion-like field leads to the rotation of CMB polarization, inducing non-zero EB cross-correlations. We show that a multipole-dependent rotation beta(l) imprints a distinct signature in the polarization spectra that can be constrained. Specifically, we consider an Early Dark Energy (EDE) scenario in which a pseudoscalar field couples to photons through a Chern-Simons interaction, generating a polarization rotation with multipole dependence. We introduce a phenomenological beta(l) as a step function, obtaining constraints on the step function size consistent with zero, with uncertainties less than 0.15 degrees (68% CL). In addition, using multi-frequency EE, BB, and EB cross-spectra, along with robust BICEP/Keck foreground treatment and likelihood framework, we derive constraints on the axion-photon coupling amplitude g for several choices of EDE parameters. For the baseline best-fit value f_EDE = 0.087 from the Planck 2018 analysis, we obtain g = 0.11 +/- 0.37 (68% CL), consistent with previous limits. |
| title | BICEP/Keck XXI: Constraints on Early-Universe Parity Violation from Multipole-Dependent Birefringence |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2603.06812 |