Journal
ASTROPHYSICAL JOURNAL
Volume 794, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/794/2/171
Keywords
cosmic background radiation; cosmology: observations; large-scale structure of universe
Categories
Funding
- Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [AST-0618398, AST-1212230]
- MEXT KAKENHI [21111002]
- KEK Cryogenics Science Center
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
- Canadian Institute for Advanced Research
- Miller Institute for Basic Research in Science
- NASA
- Simons Foundation
- Joan and Irwin Jacobs
- Comision Nacional de Investigacion Cientifica y Tecnologica de Chile (CONICYT)
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1212230] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [13J03626, 14J01662, 25610065, 24684017] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/K001051/1] Funding Source: researchfish
- STFC [ST/K001051/1] Funding Source: UKRI
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We report a measurement of the B-mode polarization power spectrum in the cosmic microwave background (CMB) using the Polarbear experiment in Chile. The faint B-mode polarization signature carries information about the universe's entire history of gravitational structure formation, and the cosmic inflation that may have occurred in the very early universe. Our measurement covers the angular multipole range 500 < l < 2100 and is based on observations of an effective sky area of 25 deg(2) with 3 '.5 resolution at 150 GHz. On these angular scales, gravitational lensing of the CMB by intervening structure in the universe is expected to be the dominant source of B-mode polarization. Including both systematic and statistical uncertainties, the hypothesis of no B-mode polarization power from gravitational lensing is rejected at 97.2% confidence. The band powers are consistent with the standard cosmological model. Fitting a single lensing amplitude parameter A(BB) to the measured band powers, A(BB) = 1.12 +/- 0.61(stat)(-0.12)(+0.04)(sys) +/- 0.07(multi), where A(BB) = 1 is the fiducial wmap-9 Lambda CDM value. In this expression, stat refers to the statistical uncertainty, sys to the systematic uncertainty associated with possible biases from the instrument and astrophysical foregrounds, and multi to the calibration uncertainties that have a multiplicative effect on the measured amplitude A(BB).
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