Can the maximum mass of neutron stars rule out any equation of state of   dense stellar matter before gravity is well understood?
  Probably No! As an example, using soft EOSs consistent with existing terrestrial nuclear laboratory experiments for hybrid neutron stars containing a quark core described with MIT bag model using reasonable parameters, we show that the recently discovered new holder of neutron star maximum mass PSR J1614-2230 of $1.97\pm0.04M_{\odot}$ can be well described by incorporating a Yukawa gravitational correction that is consistent with existing constraints from neutron-proton and neutron-lead scatterings as well as the spectroscopy of antiproton atoms. 
De-Hua Wen, Bao-An Li and Lie-Wen Chen
astro-ph.SR nucl-ex nucl-th