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    題名: Naturally large tensor-to-scalar ratio in inflation
    作者: Liu, Guo-Chin;Ng, Kin-Wang;Wang, I-Chin
    日期: 20141126
    上傳時間: 2017-11-03 02:10:16 (UTC+8)
    出版者: American Physical Society
    摘要: Recently, BICEP2 measurements of the cosmic microwave background (CMB)
    B
    -mode polarization at degree angular scales has indicated the presence of tensor modes with a high tensor-to-scalar ratio of
    r
    =
    0.2
    when assuming nearly scale-invariant tensor and scalar spectra, although the signal may be contaminated by dust emission, as implied by recent Planck polarization data. This result is in conflict with the Planck best-fit lambda cold dark model with
    r
    <
    0.11
    . Because the inflaton has to interact with other fields to convert its potential energy into radiation to reheat the Universe, the interacting inflaton may result in a suppression of the scalar spectrum at large scales. This suppression has been used to explain the observed low quadrupole in the CMB anisotropy. In this paper, we show that a combination of the tensor modes measured by BICEP2 and the large-scale suppressed scalar modes contributes to the CMB anisotropy in such a way that the resultant CMB anisotropy and polarization power spectra are consistent with both Planck and BICEP2 data. We also project our findings to cases in which
    r
    may become reduced in future CMB polarization measurements.
    關聯: Physical Review D 90, 103531(6 pages)
    DOI: 10.1103/PhysRevD.90.103531
    顯示於類別:[物理學系暨研究所] 期刊論文

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