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Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB · Around

2019

Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB

Sabti, Nashwan, Alvey, James, Escudero, Miguel et al.

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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 bound is independent of the spin and number of internal degrees of freedom of the particle, of the annihilation being s-wave or p-wave, and of the annihilation final state.

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