Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long Range Tensor Correlations in Charge and Parity Projected Fermionic
  Molecular Dynamics   Within the framework of Fermionic Molecular Dynamics a method is developed to
better account for long range tensor correlations in nuclei when working with a
single Slater determinant. Single-particle states with mixed isospin and broken
parity build up an intrinsic Slater determinant which is then charge and parity
projected. By minimizing the energy of this many-body state with respect to the
parameters of the single-particle states and projecting afterwards on angular
momentum ground state energies are obtained that are systematically lower than
corresponding Hartree-Fock results. The realistic Argonne V18 potential is used
and short range correlations are treated with the Unitary Correlation Operator
Method. Comparison with exact few-body calculations shows that in $^4$He about
one fifth of the correlation energy due to long-range correlations are
accounted for. These correlations which extend over the whole nucleus are
visualized with the isospin and spin-isospin density of the intrinsic state.
The divergence of the spin-isospin density, the source for pion fields, turns
out to be of dipole nature.

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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: econ