Equation of state for neutron stars
Mass-radius curves of representative equations of state (EOS) for nucleonic (blue), nucleonic plus exotic (pink), and strange quark (green) matter. Horizontal bars represent mass determinations of binary radio pulsars. Regions to the upper left are disallowed by General Relativity and causality. The lower right region is excluded by the highest-frequency pulsar known (716 Hz).
Last Update: 1 September 2019