Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Josephson spectroscopy of a dilute Bose-Einstein condensate in a
  double-well potential   The dynamics of a Bose-Einstein condensate in a double-well potential are
analysed in terms of transitions between energy eigenstates. By solving the
time-dependent and time-independent Gross-Pitaevskii equation in one dimension,
we identify tunnelling resonances associated with level crossings, and
determine the critical velocity that characterises the resonance. We test the
validity of a non-linear two-state model, and show that for the experimentally
interesting case, where the critical velocity is large, the influence of
higher-lying states is important.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga