Cosmic Infrared Background anisotropies as a window into primordial non-Gaussianity

Abstract

The angular power spectrum of the cosmic infrared background (CIB) is a sensitive probe of the local primordial bispectrum. CIB measurements are integrated over a large volume so that the scale dependent bias from the primordial non-Gaussianity leaves a strong signal in the CIB power spectrum. Although galactic dust dominates over the non-Gaussian CIB signal, it is possible to mitigate the dust contamination with enough frequency channels, especially if high frequencies such as the Planck 857 GHz channel are available. We show that, in this case, measurements of the cosmic microwave background from future space missions should be able to probe the local bispectrum shape down to an amplitude |f_nl| < 1.

19 pages, 9 figures, submitted to MNRAS

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• Microwave Spectro-Polarimetry of Matter and Radiation across Space and Time
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• Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps
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• Constraining the physics of star formation from CIB-cosmic shear cross-correlations
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• The information content of Cosmic Infrared Background anisotropies