English  |  正體中文  |  简体中文  |  Items with full text/Total items : 51510/86705 (59%)
Visitors : 8264880      Online Users : 70
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    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)
    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.
    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

    Files in This Item:

    File Description SizeFormat
    index.html0KbHTML49View/Open
    Naturally large tensor-to-scalar ratio in inflation.pdf293KbAdobe PDF1View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback