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Internal delensing of Cosmic Microwave Background polarization B-modes with the POLARBEAR experiment

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arxiv 1909.13832 v2 pith:K7HEWFUJ submitted 2019-09-30 astro-ph.CO astro-ph.IMgr-qc

Internal delensing of Cosmic Microwave Background polarization B-modes with the POLARBEAR experiment

S. Adachi , M. A. O. Aguilar Fa\'undez , Y. Akiba , A. Ali , K. Arnold , C. Baccigalupi , D. Barron , D. Beck
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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. Verg\`es
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classification astro-ph.CO astro-ph.IMgr-qc
keywords delensinginternalmodepolarizationanalysisbackgroundcosmicexperiment
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Using only cosmic microwave background polarization data from the POLARBEAR experiment, we measure $B$-mode polarization delensing on subdegree scales at more than $5\sigma$ significance. We achieve a 14% $B$-mode power variance reduction, the highest to date for internal delensing, and improve this result to 2% 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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