Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directed percolation process advected by the compressible flow   It will be shown how the directed percolation process in the presence of
compressible velocity fluctuations could be formulated within the means of
field-theoretic formalism, which is suitable for the renormalization group
treatment.

8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex