Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of trap anharmonicity on the critical temperature for
  Bose-Einstein condensation   The anharmonicity of a magnetic atomic trap at long distances from its center
(forty times the radius of the first atomic orbit along the elongated axis,
i.e. hundreds of microns) is shown to increase up to 45 % the temperature for
Bose-Einstein condensation. This effect is perhaps small in the traditional
traps, but should certainly be taken into account in magnetic microtraps, which
characteristic dimensions are of order 1 mm.

36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph