http://arxiv.org/abs/1406.0451
We propose a new mechanism of generating the $\mu$ distortion in cosmic microwave background (CMB) originated from primordial gravitational waves. Such $\mu$ distortion is generated by the damping of the temperature anisotropies through the Compton scattering, even on scales larger than that of the Silk damping. This mechanism is in sharp contrast with that from the primordial curvature (scalar) perturbations, in which the temperature anisotropies are mainly decayed by the Silk damping effects. We estimate the size of the $\mu$ distortion from the new mechanism, which can be used to constrain the amplitude of primordial gravitational waves on smaller scales independently from the CMB anisotropies, giving more wide-range constraint on their spectral index by combining the amplitude from the CMB anisotropies.
A. Ota, T. Takahashi, H. Tashiro, et. al.
Tue, 3 Jun 14
6/65
Comments: 15 pages, 2 figures
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