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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3170527
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