Cosmolunch: "Statistical anisotropy in CMB spectral distortions"

May 8, 2019
Wednesday, May 8, 2019 - 2:00pm to 3:00pm
PRB M2005
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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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