Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variational ansatz for the superfluid Mott-insulator transition in
  optical lattices   We develop a variational wave function for the ground state of a
one-dimensional bosonic lattice gas. The variational theory is initally
developed for the quantum rotor model and later on extended to the Bose-Hubbard
model. This theory is compared with quasi-exact numerical results obtained by
Density Matrix Renormalization Group (DMRG) studies and with results from other
analytical approximations. Our approach accurately gives local properties for
strong and weak interactions, and it also describes the crossover from the
superfluid phase to the Mott-insulator phase.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph