# Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB

@article{Sabti2019RefinedBO,
title={Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB},
author={Nashwan Sabti and J.B.G. Alvey and Miguel Escudero and Malcolm Fairbairn and Diego Blas},
journal={arXiv: High Energy Physics - Phenomenology},
year={2019}
}
• N. Sabti, +2 authors D. Blas
• Published 2019
• Physics
• arXiv: High Energy Physics - Phenomenology
New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work, we carry out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations. We find that, BBN observations set a lower bound on the thermal dark matter mass of $m_\chi > 0.4\,\text{MeV}$ at $2\sigma$. This… Expand

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