Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Implicit ladder summation in the Hartree-Fock-Bogoliubov approach   The fully variational Hartree Fock Bogoliubov approach for bosons is studied
in the limit of zero range forces in two- and three-dimensions. The equation of
state obtained in two-dimensions is expressed in a parametric form. It is shown
that the $\Lambda$ potential permits to perform an implicit summation of the
ladder diagrams without leaving the variational scheme, restoring thus the
consistency of this approximation.

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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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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: eess
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin