Violation of the Rotational Invariance in the CMB Bispectrum(Astrophysics and Cosmology)

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概要

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• We investigate a statistical anisotropy on the Cosmic Microwave Background (CMB) bispectrum, which can be generated from the primordial non-Gaussianity induced by quantum fluctuations of a vector field. We find new configurations in the multipole space of the CMB bispectrum given by l_1=l_2+l_3+2,|l_2-l_3|-2 and their permutations, which violate the rotational invariance, such as an off-diagonal configuration in the CMB power spectrum. We also find that in a model presented by Yokoyama and Soda (2008), the amplitude of the statistically anisotropic bispectrum in the above configurations becomes as large as that in other configurations such as l_1=l_2+l_3. As a result, it might be possible to detect these contributions in future experiments, which would give us novel information about the physics of the early Universe.

• 2011-11-25

著者

• SHIRAISHI Maresuke

  Department of Physics and Astrophysics, Nagoya University

• YOKOYAMA Shuichiro

  Department of Physics and Astrophysics, Nagoya University

• Yokoyama Shuichiro

  Department Of Physics And Astrophysics Nagoya University

• Shiraishi Maresuke

  Department Of Physics And Astrophysics Nagoya University

関連論文

• CMB Bispectrum from Primordial Scalar, Vector and Tensor Non-Gaussianities(Astrophysics and Cosmology)
• Use of δN Formalism : Difficulty of Generating Large Local-Type Non-Gaussianity during Inflation(Chapter II: Cosmological perturbations,Cosmology-The Next Generation-)
• CMB Bispectrum from Primordial Scalar, Vector and Tensor Non-Gaussianities
• Parity Violation of Gravitons in the CMB Bispectrum(Astrophysics and Cosmology)
• Violation of the Rotational Invariance in the CMB Bispectrum(Astrophysics and Cosmology)
• A-33: A New Analytic Formula for the Spectrum of Inflationary Curvature Perturbations(Part II: Poster Contributions, The Next Chapter in Einstein's Legacy)

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