Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nuclear energy density functional from chiral pion-nucleon dynamics:
  Isovector terms   We extend a recent calculation of the nuclear energy density functional in
the framework of chiral perturbation theory by computing the isovector surface
and spin-orbit terms: $(\vec \nabla \rho_p- \vec \nabla \rho_n)^2 G_d(\rho)+
(\vec \nabla \rho_p- \vec \nabla \rho_n)\cdot(\vec J_p-\vec J_n)
G_{so(\rho)+(\vec J_p-\vec J_n)^2 G_J(\rho)$ pertaining to different proton and
neutron densities. Our calculation treats systematically the effects from
$1\pi$-exchange, iterated $1\pi$-exchange, and irreducible $2\pi$-exchange with
intermediate $\Delta$-isobar excitations, including Pauli-blocking corrections
up to three-loop order. Using an improved density-matrix expansion, we obtain
results for the strength functions $G_d(\rho)$, $G_{so}(\rho)$ and $G_J(\rho)$
which are considerably larger than those of phenomenological Skyrme forces.
These (parameter-free) predictions for the strength of the isovector surface
and spin-orbit terms as provided by the long-range pion-exchange dynamics in
the nuclear medium should be examined in nuclear structure calculations at
large neutron excess.

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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: stat