Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bose-Einstein condensation of atoms in a uniform potential   We have observed Bose-Einstein condensation of an atomic gas in the
(quasi-)uniform three-dimensional potential of an optical box trap.
Condensation is seen in the bimodal momentum distribution and the anisotropic
time-of-flight expansion of the condensate. The critical temperature agrees
with the theoretical prediction for a uniform Bose gas. The momentum
distribution of our non-condensed quantum-degenerate gas is also clearly
distinct from the conventional case of a harmonically trapped sample and close
to the expected distribution in a uniform system. We confirm the coherence of
our condensate in a matter-wave interference experiment. Our experiments open
many new possibilities for fundamental studies of many-body physics.

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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: eess