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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111962

    Title: Naturally large tensor-to-scalar ratio in inflation
    Authors: Guo-Chin Liu;Kin-Wang Ng;I-Chin Wang
    Date: 2014-11-26
    Issue Date: 2017-11-03 02:10:16 (UTC+8)
    Publisher: American Physical Society
    Abstract: Recently, BICEP2 measurements of the cosmic microwave background (CMB)
    -mode polarization at degree angular scales has indicated the presence of tensor modes with a high tensor-to-scalar ratio of
    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
    . 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
    may become reduced in future CMB polarization measurements.
    Relation: Physical Review D 90(10), 103531(6 pages)
    DOI: 10.1103/PhysRevD.90.103531
    Appears in Collections:[物理學系暨研究所] 期刊論文

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