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  Statistically-anisotropic tensor bispectrum from inflation

Hiramatsu, T., Murai, K., Obata, I., & Yokoyama, S. (2021). Statistically-anisotropic tensor bispectrum from inflation. Journal of Cosmology and Astroparticle Physics, 2021(3): 47. doi:10.1088/1475-7516/2021/03/047.

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Hiramatsu, Takashi, Author
Murai, Kai, Author
Obata, Ippei1, Author              
Yokoyama, Shuichiro, Author
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: 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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Language(s): eng - English
 Dates: 2021-03-15
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2021/03/047
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Title: Journal of Cosmology and Astroparticle Physics
  Abbreviation : J. Cosmol. Astropart. Phys.
  Abbreviation : JCAP
Source Genre: Journal
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Pages: - Volume / Issue: 2021 (3) Sequence Number: 47 Start / End Page: - Identifier: ISSN: 1475-7516