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
Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev Lett. 2020 Apr 3;124(13):131301. 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.
