Axion instability supernovae

New particles coupled to the Standard Model can equilibrate in stellar cores if they are sufficiently heavy and strongly coupled. In this work, we investigate astrophysical consequences of such a scenario for massive stars by incorporating new contributions equation state into art structure code. We focus on axions ``cosmological triangle,'' region parameter space with $300\text{ }\text{ }\mathrm{keV}\ensuremath{\lesssim}{m}_{a}\ensuremath{\lesssim}2\text{ }\mathrm{MeV}$, ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}\ensuremath{\sim}{10}^{\ensuremath{-}5}\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ that is not presently excluded other considerations. find axion masses ${m}_{a}\ensuremath{\sim}{m}_{e}$, production core drives instability results explosive nuclear burning either series mass-shedding pulsations or completely disrupts star resulting type optical transient---an Axion Instability Supernova. predict upper black hole mass gap would be located at $37\text{ }{\mathrm{M}}_{\ensuremath{\bigodot}}\ensuremath{\le}M\ensuremath{\le}107\text{ }{\mathrm{M}}_{\ensuremath{\bigodot}}$ these theories, large shift down from standard prediction, which disfavored detection LIGO/Virgo/KAGRA GWTC-2 gravitational wave catalog beginning ${46}_{\ensuremath{-}6}^{+17}\text{ }{\mathrm{M}}_{\ensuremath{\bigodot}}$. Furthermore, axion-instability supernovae more common than pair-instability supernovae, making them excellent candidate targets James Webb Space Telescope. The methods presented work used any theory physics contains bosonic arbitrary spin. provide tools facilitate studies.