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Effects of isoscalar- and isovector-scalar meson mixing on neutron star structure
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abstract
Based on the accurately calibrated interaction FSUGold, we show that including isovector scalar $\delta$ meson and its coupling to isoscalar scalar $\sigma$ meson in the relativistic mean field (RMF) model can soften the symmetry energy $E_{\rm{sym}}(n)$ at intermediate densities while stiffen the $E_{\rm{sym}}(n)$ at high densities. We find this new RMF model can be simultaneously compatible with (1) the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities from flow data in heavy-ion collisions, (2) the neutron skin thickness of $^{208}$Pb from the PREX-II experiment, (3) the largest mass of neutron star (NS) reported so far from PSR J0740+6620, (4) the limit of $\Lambda_{1.4}\leq580$ for the dimensionless tidal deformability of the canonical 1.4$M_{\odot}$ NS from the gravitational wave signal GW170817, (5) the mass-radius relation of PSR J0030+0451 and PSR J0740+6620 measured by NICER, and thus remove the tension between PREX-II and GW170817 observed in the conventional RMF model.
Forward citations
Cited by 3 Pith papers
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Nuclear matter properties from chiral-scale effective theory including a dilatonic scalar meson
A nuclear matter model based on chiral-scale effective theory with a dilatonic meson reproduces saturation properties and yields a stiff high-density equation of state with neutron star masses near 2.8 to 3 solar masses.
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Impact of the Scalar Isovector $\delta$-meson on the description of nuclear matter and neutron star properties
Including the delta meson in relativistic mean-field models widens the allowed symmetry energy slope and curvature, changing low-mass neutron star radii while leaving maximum mass nearly fixed.
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