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

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

doi:10.1103/PhysRevLett.124.131301

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

Phys Rev Lett. 2020 Apr 3;124(13):131301. doi: 10.1103/PhysRevLett.124.131301.

Authors

S Adachi¹, M A O Aguilar Faúndez^{2

3}, Y Akiba⁴, A Ali⁵, K Arnold⁶, C Baccigalupi^{7

8

9}, D Barron¹⁰, D Beck¹¹, F Bianchini¹², J Borrill^{13

14}, J Carron¹⁵, K Cheung⁵, Y Chinone^{5

16

17}, K Crowley⁵, H El Bouhargani¹¹, T Elleflot⁶, J Errard¹¹, G Fabbian¹⁵, C Feng¹⁸, T Fujino¹⁹, N Goeckner-Wald⁵, M Hasegawa²⁰, M Hazumi^{4

16

20

21}, C A Hill⁵, L Howe⁶, N Katayama¹⁶, B Keating⁶, S Kikuchi¹⁹, A Kusaka^{17

22

23

24}, A T Lee^{5

22

25}, D Leon⁶, E Linder¹⁴, L N Lowry⁶, F Matsuda¹⁶, T Matsumura¹⁶, Y Minami²⁰, T Namikawa²⁶, M Navaroli⁶, H Nishino²⁴, J Peloton²⁷, A T P Pham¹², D Poletti^{7

8

9}, G Puglisi^{28

29}, C L Reichardt¹², Y Segawa⁴, B D Sherwin³⁰, M Silva-Feaver⁶, P Siritanasak⁶, R Stompor¹¹, O Tajima¹, S Takatori^{4

20}, D Tanabe^{4

20}, G P Teply⁶, C Vergès¹¹; POLARBEAR Collaboration

Affiliations

¹ Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
² Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
³ Departamento de Física, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago, Chile.
⁴ SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan.
⁵ Department of Physics, University of California, Berkeley, California 94720, USA.
⁶ Department of Physics, University of California, San Diego, California 92093-0424, USA.
⁷ International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy.
⁸ Institute for Fundamental Physics of the Universe (IFPU), Via Beirut 2, 34014 Trieste, Italy.
⁹ National Institute for Nuclear Physics (INFN), via Valerio 2, 34127 Trieste, Italy.
¹⁰ Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA.
¹¹ AstroParticule et Cosmologie (APC), Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, 75013 Paris, France.
¹² School of Physics, University of Melbourne, Parkville VIC 3010, Australia.
¹³ Computational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
¹⁴ Space Sciences Laboratory, University of California, Berkeley, California 94720, USA.
¹⁵ Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
¹⁶ Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
¹⁷ Kavli Institute for the Physics and Mathematics of the Universe (WPI), Berkeley Satellite, the University of California, Berkeley, California 94720, USA.
¹⁸ Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA.
¹⁹ Yokohama National University, Yokohama, Kanagawa 240-8501, Japan.
²⁰ High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
²¹ Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa 252-0222, Japan.
²² Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
²³ Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan.
²⁴ Research Center for the Early Universe, School of Science, The University of Tokyo, Tokyo 113-0033, Japan.
²⁵ Radio Astronomy Laboratory, University of California, Berkeley, California 94720, USA.
²⁶ DAMTP, University of Cambridge, Cambridge CB3 0WA, United Kingdom.
²⁷ Laboratoire de l'Accélérateur Linéaire, Université Paris-Sud, CNRS/IN2P3, 91400 Orsay, France.
²⁸ Department of Physics, Stanford University, Stanford, California 94305, USA.
²⁹ Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
³⁰ Kavli Institute for Cosmology Cambridge, Cambridge CB3 OHA, United Kingdom.

PMID: 32302154
DOI: 10.1103/PhysRevLett.124.131301

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.