Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fragmented Superradiance of a Bose-Einstein Condensate in an Optical
  Cavity   The Dicke model and the superradiance of two-level systems in a radiation
field have many applications. Recently, a Dicke quantum phase transition has
been realized with a Bose-Einstein condensate in a cavity. We numerically solve
the many-body Schr\"odinger equation and study correlations in the ground state
of interacting bosons in a cavity as a function of the strength of a driving
laser. Beyond a critical strength, the bosons occupy multiple modes
macroscopically while remaining superradiant. This fragmented superradiance can
be detected by analyzing the variance of single-shot measurements.

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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex