Imprints of MeV Scale Hidden Dark Sector at Planck Data

Abstract

New light species can contribute to the number of effective relativistic degrees of freedom ($N_{\mathrm{eff}}$) at Cosmic Microwave Background (CMB) which is precisely measured by Planck. In this work, we consider an MeV scale thermally decoupled non-minimal dark sector and study the imprint of the dark sector dynamics on the measurement of $N_{\mathrm{eff}}$ at the time of CMB formation. We have predicted the allowed region of model parameter space in the light of constraints arising from the measurements of both $N_{\mathrm{eff}}$ and dark matter relic density by Planck. It turns out that the impact of the dark sector dynamics on $N_{\mathrm{eff}}$ is significant in case of a non-hierarchical mass spectrum of the dark sector particles.

arXiv commentImproved version, published in Physics Letters B

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