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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.
Abstract

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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