Abstract
We analyze the limits on resonant particle production during inflation based upon the power spectrum of fluctuations in matter and the cosmic microwave background. We show that such a model is consistent with features observed in the matter power spectrum deduced from galaxy surveys and damped Lyman-$\ensuremath{\alpha}$ systems at high redshift. It also provides an alternative explanation for the excess power observed in the power spectrum of the cosmic microwave background fluctuations in the range of $1000<l<3500$. For our best-fit models, epochs of resonant particle creation reenter the horizon at wave numbers of ${k}_{*}\ensuremath{\sim}0.4$ and/or $0.2$ ($h\text{ }\text{ }{\mathrm{M}\mathrm{p}\mathrm{c}}^{\ensuremath{-}1}$). The amplitude and location of these features correspond to the creation of fermion species of mass $\ensuremath{\sim}1\ensuremath{-}2\text{ }\text{ }{\mathrm{M}}_{pl}$ during inflation with a coupling constant between the inflaton field and the created fermion species of near unity. Although the evidence is marginal, if this interpretation is correct, this could be one of the first observational hints of new physics at the Planck-scale.
Published Version
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