Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Negative superdiffusion due to the inhomogeneous convection   Fractional transport of particles on a comb structure in the presence of an
inhomogeneous convection flow is studied. The large scale asymptotics is
considered. It is shown that a contaminant spreads superdiffusively in the
direction opposite to the convection flow. Conditions for the realization of
this new effect is discussed in detail.

13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol