1203.1011 (O. Lourenço et al.)

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

O. Lourenço, M. Dutra, R. L. P. G. Amaral, A. Delfino

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.

View original: http://arxiv.org/abs/1203.1011