M. D. Voskresenskaya, S. Typel
An extension of the generalized relativistic mean-field (gRMF) model with
density dependent couplings is introduced in order to describe thermodynamical
properties and the composition of dense nuclear matter for astrophysical
applications. Bound states of light nuclei and two-nucleon scattering
correlations are considered as explicit degrees of freedom in the
thermodynamical potential. They are represented by quasiparticles with medium
dependent properties. The model interpolates between the correct low-density
limit, the model independent virial equation of state (VEoS), and the RMF
description around nuclear saturation density where clusters are dissolved. A
comparison between the fugacity expansions of the VEoS and the gRMF model
provides consistency relations between the quasiparticles properties, the
nucleon-nucleon scattering phase shifts and the meson-nucleon couplings of the
gRMF model at zero density. Relativistic effects are found to be important at
temperatures that are typical in astrophysical applications. The case of
neutron matter is studied in detail.
View original:
http://arxiv.org/abs/1201.1078
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