Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atom loss from the $^{85}$Rb Bose-Einstein condensate by a Feshbach
  resonance   Loss of atoms from a $^{85}$Rb condensate on passage through a Feshbach
resonance is analyzed using the generalized parametric approximation that takes
into account quantum many-body effects. These effects lead to a substantial
increase of the losses. A better agreement with experiments is achieved,
compared to predictions of mean-field theories. The method provides much
insight into the quantum effects involved, and on the nature of entangled atom
pairs produced by the loss.

32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an