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Open Access Publications from the University of California

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

  • Author(s): Adachi, S;
  • Aguilar Faúndez, MAO;
  • 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, CA;
  • Howe, L;
  • Katayama, N;
  • Keating, B;
  • Kikuchi, S;
  • Kusaka, A;
  • Lee, AT;
  • Leon, D;
  • Linder, E;
  • Lowry, LN;
  • Matsuda, F;
  • Matsumura, T;
  • Minami, Y;
  • Namikawa, T;
  • Navaroli, M;
  • Nishino, H;
  • Peloton, J;
  • Pham, ATP;
  • Poletti, D;
  • Puglisi, G;
  • Reichardt, CL;
  • Segawa, Y;
  • Sherwin, BD;
  • Silva-Feaver, M;
  • Siritanasak, P;
  • Stompor, R;
  • Tajima, O;
  • Takatori, S;
  • Tanabe, D;
  • Teply, GP;
  • Vergès, C;
  • POLARBEAR Collaboration
  • et al.

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.

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