X. Roca-Maza, X. Viñas, M. Centelles, P. Ring, P. Schuck
Although ab-initio calculations of relativistic Brueckner theory lead to
large scalar isovector fields in nuclear matter, at present, successful
versions of covariant density functional theory neglect the interactions in
this channel. A new high precision density functional DD-ME$\delta$ is
presented which includes four mesons $\sigma$, $\omega$, $\delta$, and $\rho$
with density dependent meson-nucleon couplings. It is based to a large extent
on microscopic ab-initio calculations in nuclear matter. Only four of its
parameters are determined by adjusting to binding energies and charge radii of
finite nuclei. The other parameters, in particular the density dependence of
the meson-nucleon vertices, are adjusted to non-relativistic and relativistic
Brueckner calculations of symmetric and asymmetric nuclear matter. The
isovector effective mass $m_{p}^{\ast}-m_{n}^{\ast}$ derived from relativistic
Brueckner theory is used to determine the coupling strength of the
$\delta$-meson and its density dependence.
View original:
http://arxiv.org/abs/1110.2311
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