Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical dynamics and tree-like spatiotemporal patterns in
  exciton-polaritoncondensates   We study nonresonantly pumped exciton-polariton system in the vicinity of the
dynamical instability threshold. We find that the system exhibits unique and
rich dynamics, which leads to spatiotemporal pattern formation. The patterns
have a tree-like structure and are reminiscent of structures that appear in a
variety of soft matter systems. Within the approximation of slow and fast time
scales, we show that the polariton model exhibits self-replication point in
analogy to reaction-diffusion systems.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol