Bayesian analysis for two-parameter hybrid EoS with high-mass compact star twins

Abstract

We perform a Bayesian analysis in the basis of a recently developed two-parameter class of hybrid equations of state that allow for high-mass compact star twins. While recently a wide range of radii, from 9 - 15 km, has been inferred for different neutron stars using different techniques, we perform our analysis under the supposition that the radii are towards the large end ($13-15$ km). We use this radius constraint together with the undebated statistically independent constraint for high masses ($\sim 2M_{\odot }$) as priors in selecting the most probable hybrid equations of state from a family with two free parameters: the baryon excluded volume in the hadronic phase and the 8-quark vector channel interaction in the quark matter phase.

Comments: 11 pages, 3 figures, Proceedings of the Conference "Compact Stars in the QCD Phase Diagram IV", September 26-30, 2014, Prerow, Germany