Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum coherence of double-well BEC: a SU(2)-coherent-state
  path-integral approach   Macroscopic quantum coherence of Bose gas in a double-well potential is
studied based on SU(2)-coherent-state path-integral. The ground state and
fluctuations around it can be obtained by this method. In this picture, one can
obtain macroscopic quantum superposition states for attractive Bose gas. The
coherent gap of degenerate ground states is obtained with the instanton
technique. The phenomenon of macroscopic quantum self-trapping is also
discussed.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc