Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum simulation of expanding space-time with tunnel-coupled
  condensates   We consider two weakly interacting quasi-1D condensates of cold bosonic
atoms. It turns out that a time-dependent variation of the tunnel-coupling
between those condensates is equivalent with the spatial expansion of a
one-dimensional toy-Universe with regard to the dynamics of the relative phase
field. The dynamics of this field is governed by the quantum sine-Gordon
equation. Thus, this analogy could be used to 'quantum simulate' the dynamics
of a scalar, interacting quantum field on an expanding background. We discuss,
how to observe the freezing out of quantum fluctuations during an accelerating
expansion in a possible experiment. We also discuss an experimental protocol to
study the formation of sine-Gordon breathers in the relative phase field out of
quantum fluctuations.

19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph