Tuesday, March 6, 2012

1203.1011 (O. Lourenço et al.)

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

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