Statistically-anisotropic tensor bispectrum from inflation
Statistically-anisotropic tensor bispectrum from inflation
复制标题
通货膨胀的统计各向异性张量双谱
DOI:
10.1088/1475-7516/2021/03/047
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发表时间:
2021
影响因子:
6.4
通讯作者:
Yokoyama Shuichiro
中科院分区:
文献类型:
--
作者:
Hiramatsu Takashi;Murai Kai;Obata Ippei;Yokoyama Shuichiro
We develop a possibility of generating tensor non-Gaussianity in a kind of anisotropic inflation, where a (1) gauge field is kinetically coupled to a spectator scalar field. Owing to this coupling, the coherent mode of the electric field appears and softly breaks the isotropy of the Universe. We compute the bispectrum of linearly-polarized tensor perturbations sourced by the gauge field and find that it is strongly red-tilted and has distinctive statistical anisotropies including higher-order multipole moments. Interestingly, the tensor bispectra with the specific combinations of linear polarization modes are dominant, and their amplitudes depend on the different sets of multipole moments. This new type of statistically-anisotropic tensor non-Gaussianity can be potentially testable with the upcoming cosmic microwave background B-mode polarization experiments.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
N. Bartolo;E. Dimastrogiovanni;M. Liguori;S. Matarrese;A. Riotto
通讯作者:
A. Riotto
影响因子:
8.6
作者:
Masa-aki Watanabe;S. Kanno;J. Soda
通讯作者:
Masa-aki Watanabe;S. Kanno;J. Soda
影响因子:
5
作者:
Mindaugas Karčiauskas;K. Dimopoulos;D. Lyth
通讯作者:
D. Lyth
影响因子:
5
作者:
Obata Ippei;Fujita Tomohiro
通讯作者:
Fujita Tomohiro
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
M. Kamionkowski;T. Souradeep
通讯作者:
T. Souradeep