Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the existence of an upper critical dimension for systems within the
  KPZ universality class   In this work we extend the etching model to $d+1$ dimensions. This permits us
to investigate its exponents behaviour on higher dimensions, to try to verify
the existence of an upper critical dimension for the KPZ equations, with our
results sugesting that $d=4$ is not an upper critical dimension for the etching
model.

30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th