Big Bang Nucleosynthesis constraints on resonant DM annihilations

Abstract We perform a systematic study of BBN constraints from photodisintegration for scenarios in which dark-matter annihilations are resonantly-enhanced. To this end, we implement and make available a new class ResonanceModel within an updated version v1.3.0 of ACROPOLIS . While the corresponding implementation is done in a rather model-independent way, we also make available three benchmark models that can be used to calculate constraints for more concrete scenarios. Using this new version of ACROPOLIS , we present for the first time the corresponding constraints on resonantly-enhanced s -wave and p -wave annihilations. We show that for s -wave annihilations the bounds are usually very similar to the ones without a resonance, while for p -wave annihilations the bounds can be significantly stronger. The updated version v1.3.0 of ACROPOLIS can be found at https://github.com/hep-mh/acropolis .