Hyperonic phase transitions in dense matter

The Chiral Mean Field model (CMF) \cite{Dexheimer:2009hi} is an effective relativistic chiral model that describes hadrons, quarks, and leptons within a wide range of densities and temperatures, including those found in neutron stars, neutron star mergers, and heavy-ion collisions. It has been fitted to reproduce nuclear saturation properties, astrophysical data, and lattice QCD results \cite{Kumar:2024owe}. We have developed a new CMF code in C++ at vanishing temperature, called CMF++ \cite{Cruz-Camacho:2024odu}, that for the first time allows one to independently vary the three relevant chemical potentials, $\mu_B$, $\mu_Q$, and $\mu_S$. Due to the accuracy provided by the new CMF++ code, part of the MUSES cyberinfrastructure, we can take high-order derivatives of the equation of state for the first time. We found that including hyperons and Delta baryons in combination with specific couplings between particles can introduce reasonably strong phase transitions in dense matter. Here we determine the order of these phase transitions via susceptibilities and discuss their consequences for stellar simulations.