title: Measurement of the cosmic microwave background polarization lensing power spectrum with the POLARBEAR experiment.
abstract: Gravitational lensing due to the large-scale distribution of matter in the cosmos distorts the primordial cosmic microwave background (CMB) and thereby induces new, small-scale B-mode polarization. This signal carries detailed information about the distribution of all the gravitating matter between the observer and CMB last scattering surface. We report the first direct evidence for polarization lensing based on purely CMB information, from using the four-point correlations of even- and odd-parity E- and B-mode polarization mapped over ∼30 square degrees of the sky measured by the POLARBEAR experiment. These data were analyzed using a blind analysis framework and checked for spurious systematic contamination using null tests and simulations. Evidence for the signal of polarization lensing and lensing B modes is found at 4.2σ (stat+sys) significance. The amplitude of matter fluctuations is measured with a precision of 27%, and is found to be consistent with the Lambda cold dark matter cosmological model. This measurement demonstrates a new technique, capable of mapping all gravitating matter in the Universe, sensitive to the sum of neutrino masses, and essential for cleaning the lensing B-mode signal in searches for primordial gravitational waves.
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authors: Ade
authors: The Graduate University for Advanced Studies, Hayama, Miura District, Kanagawa 240-0115, Japan.
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authors: Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, Colorado 80309, USA.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
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authors: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA.
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authors: Physics Department, McGill University, Montreal, Quebec H3A 0G4, Canada.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: AstroParticule et Cosmologie, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, France and International School for Advanced Studies (SISSA), Trieste 34014, Italy.
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authors: Department of Physics, University of California, San Diego, La Jolla, California 92093-0424, USA.
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authors: Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA and Columbia University, New York, New York 10027, USA.
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authors: Physics Department, McGill University, Montreal, Quebec H3A 0G4, Canada.
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authors: Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, Colorado 80309, USA and Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, Colorado 80309, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
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authors: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
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authors: The Graduate University for Advanced Studies, Hayama, Miura District, Kanagawa 240-0115, Japan and High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan and Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
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authors: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
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authors: Space Sciences Laboratory, University of California, Berkeley, Berkeley, California 94720, USA and Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 92093-0424, USA.
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