Cosmolunch: "Statistical anisotropy in CMB spectral distortions"

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May 8, 2019
2:00PM - 3:00PM
Location
PRB M2005

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Add to Calendar 2019-05-08 14:00:00 2019-05-08 15:00:00 Cosmolunch: "Statistical anisotropy in CMB spectral distortions" Atsuhisa Ota (Cambridge) In this talk, I will present a new method to test the statistical isotropy in the early Universe with the cosmic microwave background spectral y-distortion, which is known as the Compton-y parameter of the CMB energy spectrum. Based on second-order cosmological perturbation theory, I will show that the 1-point ensemble averages of the y-distortion anisotropies vanish for the statistically "isotropic" perturbations. Then, I will present that they do not vanish for the statistically "anisotropic" perturbations and that they are directly related to the anisotropic part of the primordial density powerspectrum. In particular, I will show that the quadrupole anisotropy in the primordial density powerspectrum leaves the quadrupole anisotropy in the CMB y distortions. PRB M2005 Center for Cosmology and AstroParticle Physics (CCAPP) ccapp@osu.edu America/New_York public
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Atsuhisa Ota (Cambridge)

In this talk, I will present a new method to test the statistical isotropy in the early Universe with the cosmic microwave background spectral y-distortion, which is known as the Compton-y parameter of the CMB energy spectrum. Based on second-order cosmological perturbation theory, I will show that the 1-point ensemble averages of the y-distortion anisotropies vanish for the statistically "isotropic" perturbations. Then, I will present that they do not vanish for the statistically "anisotropic" perturbations and that they are directly related to the anisotropic part of the primordial density powerspectrum. In particular, I will show that the quadrupole anisotropy in the primordial density powerspectrum leaves the quadrupole anisotropy in the CMB y distortions.

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