Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of dynamical instability for a Bose-Einstein condensate in a
  moving 1D optical lattice   We have experimentally studied the unstable dynamics of a harmonically
trapped Bose-Einstein condensate loaded into a 1D moving optical lattice. The
lifetime of the condensate in such a potential exhibits a dramatic dependence
on the quasimomentum state. This is unambiguously attributed to the onset of
dynamical instability, after a comparison with the predictions of the
Gross-Pitaevskii theory. Deeply in the unstable region we observe the rapid
appearance of complex structures in the atomic density profile, as a
consequence of the condensate phase uniformity breakdown.

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The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org