Point-Coupling Models from Mesonic Hypermassive Limit and Mean-Field Approaches

Abstract

In this work we show how nonlinear point-coupling models, described by a Lagrangian density that presents only terms up to fourth order in the fermion condensate $(\bar{\psi }\psi )$, are derived from a modified meson-exchange nonlinear Walecka model. The derivation can be done through two distinct methods, namely, the hypermassive meson limit within a functional integral approach, and the mean-field approximation in which equations of state at zero temperature of the nonlinear point-coupling models are directly obtained.

18 pages. Accepted for publication in Braz. J. Phys

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Cited by in corpus (2)

• Correlations between the nuclear matter symmetry energy, its slope, and curvature from a nonrelativistic solvable approach and beyond
• Strongly interacting matter in extreme magnetic fields