Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-State Properties of Magnetically Trapped Bose-Condensed Rubidium
  Gas   We give a quantitative account of the ground-state properties of the dilute
magnetically trapped $^{87}$Rb gas recently cooled and Bose-Einstein condensed
at nanokelvin-scale temperatures. Using simple scaling arguments, we show that
at large particle number the kinetic energy is a small perturbation, and find a
spatial structure of the cloud of atoms and its momentum distribution dependent
in an essential way on particle interactions. We also estimate the superfluid
coherence length and the critical angular velocity at which vortex lines become
energetically favorable.

2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an