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The first year of observations by the Planck satellite mission shows that thecosmic microwave background (CMB) fluctuations are consistent with gaussianstatistics in the primordial perturbations, a key prediction of the simplestmodels of inflation. However, there are hints of anomalies in the CMB powerspectrum and bispectrum. We check for the possibility that some of theseanomalous features have a common physical origin in a transient reduction ofthe inflaton speed of sound. We do this by exploiting predicted correlationsbetween the power spectrum and bispectrum. Our results suggest that currentdata might already be sensitive enough to detect transient reductions in thespeed of sound as mild as a few percent. Since this is a signature ofinteractions, it opens a new window for the detection of extra degrees offreedom during inflation.

Localized correlated features in the CMB power spectrum and primordial bispectrum from a transient reduction in the speed of sound