Mind the gaps: Applying Bayesian model mixing to the dense matter equation of state

The dense matter equation of state (EOS) has seen several breakthrough developments in recent years. Calculations in chiral effective field theory up to N3LO describe the low-density region, and calculations in perturbative QCD up to N2LO describe the deconfined quark matter that occurs at high densities. However, spanning the overall space in density that the EOS covers in a statistically consistent manner, with well-quantified uncertainties, remains a challenging problem. We present results for the EOS pressure and speed of sound squared obtained using Bayesian model mixing (BMM) of chiral effective field theory and perturbative QCD. Future work to improve the resulting EOS using additional information will be discussed.