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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111960

    Title: Cosmic birefringence fluctuations and cosmic microwave background B-mode polarization
    Authors: Lee, Seokcheon;Liu, Guo-Chin;Ng, Kin-Wang
    Date: 2015-06-30
    Issue Date: 2017-11-03 02:10:12 (UTC+8)
    Publisher: Elsevier BV * North-Holland
    Abstract: Recently, BICEP2 measurements of the cosmic microwave background (CMB) B-mode polarization has
    indicated the presence of primordial gravitational waves at degree angular scales, inferring the tensor-toscalar
    ratio of r = 0.2 and a running scalar spectral index, provided that dust contamination is low. In
    this Letter, we show that the existence of the fluctuations of cosmological birefringence can give rise to
    CMB B-mode polarization that fits BICEP2 data with r < 0.11 and no running of the scalar spectral index.
    When dust contribution is taken into account, we derive an upper limit on the cosmological birefringence,
    Aβ2 < 0.0075, where A is the amplitude of birefringence fluctuations that couple to electromagnetism
    with a coupling strength β.
    Relation: Physics Letters B 746, p.406-409
    DOI: 10.1016/j.physletb.2015.05.038
    Appears in Collections:[物理學系暨研究所] 期刊論文

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