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    Results of gravitational lensing and primordial gravitational waves from the POLARBEAR experiment

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    Author
    Chinone, Y; Adachi, S; Ade, PAR; Aguilar, M; Akiba, Y; Arnold, K; Baccigalupi, C; Barron, D; Beck, D; Beckman, S; ...
    Date
    2020-01-01
    Source Title
    Journal of Physics : Conference Series
    Publisher
    IOP PUBLISHING LTD
    University of Melbourne Author/s
    Reichardt, Christian; Bianchini, Federico
    Affiliation
    School of Physics
    Metadata
    Show full item record
    Document Type
    Conference Paper
    Citations
    Chinone, Y., Adachi, S., Ade, P. A. R., Aguilar, M., Akiba, Y., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Beckman, S., Bianchini, F., Boettger, D., Borrill, J., ElBouhargani, H., Carron, J., Chapman, S., Cheung, K., Crowley, K., Cukierman, A. ,... Zhou, Y. (2020). Results of gravitational lensing and primordial gravitational waves from the POLARBEAR experiment. 16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019), 1468, (1), IOP PUBLISHING LTD. https://doi.org/10.1088/1742-6596/1468/1/012007.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251351
    DOI
    10.1088/1742-6596/1468/1/012007
    Open Access URL
    https://iopscience.iop.org/article/10.1088/1742-6596/1468/1/012007/pdf
    Abstract
    POLARBEAR is a Cosmic Microwave Background radiation (CMB) polarization experiment that is located in the Atacama Desert in Chile. The scientific goals of the experiment are to characterize the B-mode signal from gravitational lensing, as well as to search for B-mode signals created by primordial gravitational waves (PGWs). Polarbear started observations in 2012 and has published a series of results. These include the first measurement of a nonzero B-mode angular auto-power spectrum at sub-degree scales where the dominant signal is gravitational lensing of the CMB. In addition, we have achieved the first measurement of crosscorrelation between the lensing potential, which was reconstructed from the CMB polarization data alone by Polarbear, and the cosmic shear field from galaxy shapes by the Subaru Hyper Suprime-Cam (HSC) survey. In 2014, we installed a continuously rotating half-wave plate (CRHWP) at the focus of the primary mirror to search for PGWs and demonstrated the control of low-frequency noise. We have found that the low-frequency B-mode power in the combined dataset with the Planck high-frequency maps is consistent with Galactic dust foreground, thus placing an upper limit on the tensor-to-scalar ratio of r < 0.90 at the 95% confidence level after marginalizing over the foregrounds.

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