Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractal structure of the effective action in (quasi-) planar models with
  long-range interactions   We derive the effective potential for composite fields in a class of (quasi-)
planar models with long-range interactions. This class of models can be
relevant for high temperature superconductors and graphite. The fractal
structure of the effective potential is revealed and its physical
interpretation is presented. It is argued that the multi-branched fractal
structure of the potential reflects the presence of an infinite tower of
excitonic bound states that occur as a result of the long-range interactions.

16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom