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2020

Updated BBN constraints on electromagnetic decays of MeV-scale particles

Depta, Paul Frederik, Hufnagel, Marco, Schmidt-Hoberg, Kai

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In this work, we revise and update model-independent constraints from Big Bang Nucleosynthesis on MeV-scale particles $\phi$ which decay into photons and/or electron-positron pairs.

We use the latest determinations of primordial abundances and extend the analysis in arXiv:1808.09324 by including all spin-statistical factors as well as inverse decays, significantly strengthening the resulting bounds in particular for small masses.
For a very suppressed initial abundance of $\phi$, these effects become ever more important and we find that even a pure 'freeze-in' abundance can be significantly constrained.
In parallel to this article, we release the public code ACROPOLIS which numerically solves the reaction network necessary to evaluate the effect of photodisintegration on the final light element abundances.

Updated BBN constraints on electromagnetic decays of MeV-scale particles · Around

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