In an RMF model with sigma-delta meson coupling, the quartic symmetry energy term S4 can exceed 1000 MeV at neutron-star densities, challenging the standard parabolic expansion.
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Anomalous quartic term in the expansion of the symmetry energy
In an RMF model with sigma-delta meson coupling, the quartic symmetry energy term S4 can exceed 1000 MeV at neutron-star densities, challenging the standard parabolic expansion.