Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multicritical behavior in coupled directed percolation processes   We study a hierarchy of directed percolation (DP) processes for particle
species A, B, ..., unidirectionally coupled via the reactions A -> B, ... When
the DP critical points at all levels coincide, multicritical behavior emerges,
with density exponents \beta^{(k)} which are markedly reduced at each hierarchy
level k >= 2. We compute the fluctuation corrections to \beta^{(2)} to
O(\epsilon = 4-d) using field-theoretic renormalization group techniques. Monte
Carlo simulations are employed to determine the new exponents in dimensions d
<= 3.

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The categories of this paper are: hep-lat
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The categories of this paper are: econ
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: physics