Abstract
We discuss the density dependence and coupling-constant dependence of the nuclear symmetry energy in the relativistic mean field approximation of the σ − ω − ρ model. An extremely stiff density dependence of symmetry energy is obtained. At the same time, we find that the coupling constants gσ and gω have greater effect on the nuclear symmetry energy than the self-coupling constants c and d. In particular, gω and gσ determine the slope L and curvature Ksym of nuclear symmetry energy at saturation density, respectively.
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