Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of the initial state in the collapse of a Bose condensed gas   The stability of a Bose condensed gas with a negative scattering length is
studied with regard to the role played by the initial state. A trapped ideal
gas ground state is shown to be unstable when the Gross Pitaevskii equation
still predicts the existence of a stable state. A possible relation to a recent
experimental study of the critical conditions for stability or collapse of a
Bose Einstein condensate [J.L. Roberts et al., Phys. Rev. Lett. 86, 4211
(2001)] is discussed.

16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th