We show that inflationary models with broken rotational invariance generate testable off-diagonal signatures in the correlation between the μ-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 nonvanishing μ-T correlation when |1-2|=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 a high signal-to-noise ratio.
Measuring primordial anisotropic correlators with CMB spectral distortions
LIGUORI, MICHELE;BARTOLO, NICOLA;MATARRESE, SABINO
2015
Abstract
We show that inflationary models with broken rotational invariance generate testable off-diagonal signatures in the correlation between the μ-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 nonvanishing μ-T correlation when |1-2|=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 a high signal-to-noise ratio.
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