Internal Delensing of Cosmic Microwave Background Polarization B-Modes with the POLARBEAR Experiment

Adachi, S.; Aguilar Faundez, M. A. O.; Akiba, Y.; Ali, A.; Arnold, K.; Baccigalupi, C.; Barron, D.; Beck, D.; Bianchini, F.; Borrill, J.; Carron, J.; Cheung, K.; Chinone, Y.; Crowley, K.; El Bouhargani, H.; Elleflot, T.; Errard, J.; Fabbian, G.; Feng, C.; Fujino, T.; Goeckner-Wald, N.; Hasegawa, M.; Hazumi, M.; Hill, C. A.; Howe, L.; Katayama, N.; Keating, B.; Kikuchi, S.; Kusaka, A.; Lee, A. T.; Leon, D.; Linder, E.; Lowry, L. N.; Matsuda, F.; Matsumura, T.; Minami, Y.; Namikawa, T.; Navaroli, M.; Nishino, H.; Peloton, J.; Pham, A. T. P.; Poletti, D.; Puglisi, G.; Reichardt, C. L.; Segawa, Y.; Sherwin, B. D.; Silva-Feaver, M.; Siritanasak, P.; Stompor, R.; Tajima, O.; Takatori, S.; Tanabe, D.; Teply, G. P.; Verges, C.

doi:10.1103/PhysRevLett.124.131301

Using only cosmic microwave background polarization data from the polarbear experiment, we measure B-mode polarization delensing on subdegree scales at more than 5σ significance. We achieve a 14% B-mode power variance reduction, the highest to date for internal delensing, and improve this result to 22% by applying for the first time an iterative maximum a posteriori delensing method. Our analysis demonstrates the capability of internal delensing as a means of improving constraints on inflationary models, paving the way for the optimal analysis of next-generation primordial B-mode experiments.

Internal Delensing of Cosmic Microwave Background Polarization B-Modes with the POLARBEAR Experiment / Adachi, S.; Aguilar Faundez, M. A. O.; Akiba, Y.; Ali, A.; Arnold, K.; Baccigalupi, C.; Barron, D.; Beck, D.; Bianchini, F.; Borrill, J.; Carron, J.; Cheung, K.; Chinone, Y.; Crowley, K.; El Bouhargani, H.; Elleflot, T.; Errard, J.; Fabbian, G.; Feng, C.; Fujino, T.; Goeckner-Wald, N.; Hasegawa, M.; Hazumi, M.; Hill, C. A.; Howe, L.; Katayama, N.; Keating, B.; Kikuchi, S.; Kusaka, A.; Lee, A. T.; Leon, D.; Linder, E.; Lowry, L. N.; Matsuda, F.; Matsumura, T.; Minami, Y.; Namikawa, T.; Navaroli, M.; Nishino, H.; Peloton, J.; Pham, A. T. P.; Poletti, D.; Puglisi, G.; Reichardt, C. L.; Segawa, Y.; Sherwin, B. D.; Silva-Feaver, M.; Siritanasak, P.; Stompor, R.; Tajima, O.; Takatori, S.; Tanabe, D.; Teply, G. P.; Verges, C.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:13(2020), pp. 131301-1-131301-7. [10.1103/PhysRevLett.124.131301]