Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Breakdown of the superfluidity of a matter wave in a random environment   We consider a guided Bose-Einstein matter wave flowing through a disordered
potential. We determine the critical velocity at which superfluidity is broken
and compute its statistical properties. They are shown to be connected to
extreme values of the random potential. Experimental implementations of this
physics are discussed.

2
The categories of this paper are: math
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn