Across five real gas equations of state, nuclear incompressibility K0 is positively correlated with the liquid-gas critical temperature and density, and negatively correlated with the quarkyonic transition density and the peak speed of sound.
Density-dependent van der Waals model under the GW170817 constraint
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abstract
We propose a density-dependent function for the attractive interaction in the original van der Waals model to correctly describe the flow constraint at the high-density regime of the symmetric nuclear matter. After a generalization to asymmetric nuclear matter, it was also possible to study the stellar matter regime from this new model. The mass-radius relation for neutron stars under $\beta$-equilibrium is found to agree with recent X-ray observations. The neutron star masses supported against gravity, obtained from some parametrizations of the model, are in the range of $(1.97-2.07)M_{\odot}$, compatible with observational data from the PSR J0348+0432 pulsar. Furthermore, we verify the reliability of the model in predicting tidal deformabilities of the binary system related to the GW170817 neutron star merger event and find a full agreement with the new bounds obtained by the LIGO/Virgo collaboration.
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Correlations between nuclear incompressibility, liquid-gas critical point, and quarkyonic transition
Across five real gas equations of state, nuclear incompressibility K0 is positively correlated with the liquid-gas critical temperature and density, and negatively correlated with the quarkyonic transition density and the peak speed of sound.