The modification, by exotic sources of cooling, of the neutrino burst's duration following the core collapse of SN 1987A is known to provide a formidable constraint on axion interactions with matter. Compton-like nucleon-pion to nucleon-axion scattering has recently been shown to be an important mechanism, due to the large baryon and the non-negligible pion densities in the concerned proto-neutron star volume. In this context, the question arises of the role of hadronic matter beyond the first generation - in particular strange matter. We perform a first quantitative study of this question, by consistently including the full baryon and meson octets in axion emission from Compton-like scattering and from baryon decay. We consider a range of possible thermodynamic conditions in the SN as well as various scenarios for the axion-quark couplings – among them an "agnostic" scenario bounded only by data. Irrespective of the scenario considered, we find that axion emissivity introduces non-trivial correlations between flavour-diagonal axial couplings and constrains the off-diagonal counterpart to O(0.1-0.01) for fa=10^9 GeV.
I will begin by introducing the Lagrangian that we have used, then the important observable of the study, which is emissivity, and finally I will present the results in relation to what already existed in the literature, where the focus was on the interaction with pions and nucleons.
Based on the paper “Axion emission from strange matter in core-collapse SNe” [https://arxiv.org/abs/2401.10979] Mael Cavan Piton (Lapth), Diego Guadagnoli (Lapth), Micaela Oertel (LUTH), Hyeonseok Seong (DESY), Ludovico Vittorio (Lapth)
