Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave pattern induced by a localized obstacle in the flow of a
  one-dimensional polariton condensate   Motivated by recent experiments on generation of wave patterns by a polariton
condensate incident on a localized obstacle, we study the characteristics of
such flows under the condition that irreversible processes play a crucial role
in the system. The dynamics of a non-resonantly pumped polariton condensate in
a quasi-one-dimensional quantum wire is modeled by a Gross-Pitaevskii equation
with additional phenomenological terms accounting for the dissipation and
pumping processes. The response of the condensate flow to an external potential
describing a localized obstacle is considered in the weak-perturbation limit
and also in the nonlinear regime. The transition from a viscous drag to a
regime of wave resistance is identified and studied in detail.

27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph