Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boundary effects in reaction-diffusion processes   The effects of a boundary on reaction systems are examined in the framework
of the general single-species reaction/coalescence process. The boundary
naturally represents the reactants' container, but is applicable to exciton
dynamics in a doped TMMC crystal. We show that a density excess, which extends
into the system diffusively from the boundary, is formed in two dimensions and
below. This implies a surprising result for the magnetisation near a fixed spin
in the coarsening of the one-dimensional critical Ising model. The universal,
dimensionally-dependent functional forms of this density excess are given by an
exact solution and the field-theoretic renormalisation group.

20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph