Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-consistent approach for Bose-condensed atoms in optical lattices   Bose atoms in optical lattices are considered at low temperatures and weak
interactions, when Bose-Einstein condensate is formed. A self-consistent
approach, based on the use of a representative statistical ensemble, is
employed, ensuring a gapless spectrum of collective excitations and the
validity of conservation laws. In order to show that the approach is applicable
to both weak and tight binding, the problem is treated in the Bloch as well as
in the Wannier representations. Both these ways result in similar expressions
that are compared for the self-consistent Hartree-Fock-Bogolubov approximation.
A convenient general formula for the superfluid fraction of atoms in an optical
lattice is derived.

1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th