Footprint of two-form field: Statistical anisotropy in primordial gravitational waves
Footprint of two-form field: Statistical anisotropy in primordial gravitational waves
复制标题
两种形式场的足迹:原初引力波的统计各向异性
DOI:
10.1103/physrevd.99.023513
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发表时间:
2019
影响因子:
5
通讯作者:
Fujita Tomohiro
中科院分区:
文献类型:
--
作者:
Obata Ippei;Fujita Tomohiro
We study the observational signatures of a two-form field in inflationary cosmology. In our setup a two-form field is kinetically coupled to a spectator scalar field and generates sizable gravitational waves and smaller curvature perturbation. We find that the sourced gravitational waves have a distinct signature: they are always statistically anisotropic and their spherical moments are nonzero for hexadecapole and tetrahexacontapole, while the quadrupole moment vanishes. Since their amplitude can reachin the tensor-to-scalar ratio, we expect this novel prediction will be tested in the next generation of cosmic microwave background experiments.
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期刊:
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