教師資料查詢 | 類別: 期刊論文 | 教師: 劉國欽 LIOU GUO CHIN (瀏覽個人網頁)

標題:Naturally large tensor-to-scalar ratio in inflation
學年103
學期1
出版(發表)日期2014/11/26
作品名稱Naturally large tensor-to-scalar ratio in inflation
作品名稱(其他語言)
著者Guo-Chin Liu; Kin-Wang Ng; I-Chin Wang
單位
出版者
著錄名稱、卷期、頁數Physical Review D 90(10), 103531(6 pages)
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.
關鍵字
語言英文
ISSN1550-7998
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版
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