http://arxiv.org/abs/1506.06670
We show that inflationary models with broken rotational invariance generate testable off-diagonal signatures in the correlation between the $\mu$-type distortion and temperature fluctuations of the Cosmic Microwave Background. More precisely, scenarios with a quadrupolar bispectrum asymmetry, usually generated by fluctuations of primordial vector fields, produce a non-vanishing $\mu$-$T$ correlation when $|\ell_1-\ell_2|=2$. Since spectral distortions are sensitive to primordial fluctuations up to very small scales, a cosmic variance limited spectral distortion experiment can detect such effects with high signal-to-noise.
M. Shiraishi, M. Liguori, N. Bartolo, et. al.
Tue, 23 Jun 15
1/67
Comments: 8 pages, 3 figures
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