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

Journal Article · 01 April 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.124.131301 · OSTI ID:1616762

Adachi, S. ; Aguilar Faúndez, 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.; Vergès, C.

Using only cosmic microwave background polarization data from the polarbear experiment, we measure B-ode 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. Finally, 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.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); European Research Council (ERC); JSPS KAKENHI; Moore Foundation; Simons Foundation; Templeton Foundation
• Contributing Organization: POLARBEAR Collaboration
• Grant/Contract Number: AC02-76SF00515; AST-0618398; AST-1212230; 77047; 616170; ST/P000525/1; 18K13558; 18H04347; 19H00674; JP26220709; JP15H05891; JP26800125; JP16K21744; JP18H05539; FT150100074; 4633; 034079; 58724; 1130777; 1171811; AC02-05CH11231
• OSTI ID: 1616762
• Alternate ID(s): OSTI ID: 1607960; OSTI ID: 1616130
• Journal Information: Physical Review Letters, Vol. 124, Issue 13; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English