A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND B-MODE POLARIZATION POWER SPECTRUM AT SUB-DEGREE SCALES WITH POLARBEAR

By The Polarbear Collaboration P.A.R. Ade, Y. Akiba, A. Anthony, K. Arnold, M. Atlas, D. Barron, D. Boettger, J. Borrill, S. Chapman, Y. Chinone and 63 more. 2014

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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 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 ABB to the measured band powers, , where ABB = 1 is the fiducial wmap-9 ΛCDM 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 ABB.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/4d3e5c8c7dbd5c6cb5a308fcb236396b0ef31413

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Citations in the corpus

The Simons Observatory: science goals and forecasts (2018, methodology): “…to apply component separation methods to extract maps of the Compton-y signal over large sky areas using the known tSZ spectral function, as has been possible recently for the first time with Planck (Planck Collaboration 2014d; Hill and Spergel 2014; Planck Collaboration 2016h; Khatri 2016).”
Planck2015 results (2015, unknown): “SPT (Story et al. 2015) collaborations, and the former have also made a direct measurement of the BB power spectrum due to lensing on small angular scales with a significance around 2σ (POLARBEAR Collaboration 2014a).”
Joint Analysis of BICEP2/Keck Array and Planck Data (2015, unknown): “[46] POLARBEAR Collaboration, A measurement of the cosmic microwave background B-mode polarization power spectrum at sub-degree scales with POLARBEAR, Astrophys.”