Fig. 2: Characterization and microscopic interpretation of the equations of state. | Nature Physics

Fig. 2: Characterization and microscopic interpretation of the equations of state.

From: Evidence for quark-matter cores in massive neutron stars

Fig. 2

a, A 3D rendering of trajectories of a representative subset of interpolated (thin black lines) and hadronic (thick black lines) EoSs in a space spanned by the polytropic index γ, the pressure ratio p/pFD and the squared speed of sound \({c}_{\rm{s}}^{2}\). The solid blue and empty cyan diamonds mark the centres of 1.4M NSs, and the solid red and empty magenta circles denote the same for \({M}_{\max }\) stars. The thick light blue line denotes the region of the 3D space spanned by the high-density pQCD EoS, and the region occupied by low-density matter is indicated by the label ‘Nucl’. b,c, Projection of the 3D image to the p/pFDγ (b) and \({c}_{\rm{s}}^{2}\)γ (c) planes. In c, the light blue star indicates the high-density conformal pQCD limit. An animation of the figure is available as Supplementary Video 1.

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