Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluctuation and gauge effects on the critical behavior of
  superconductors   Gauge effects on the fluctuation properties of the normal-to-superconducting
phase transition in bulk and thin film superconductors are reviewed. Similar
problems in the description of other natural systems (liquid crystals, quantum
field theory, early universe) are also discussed. The relatively strong gauge
effects on the fluctuations of the ordering field at low spatial dimensionality
$D$ and, in particular, in thin (quasi-2D) films are considered in details. A
special attention is paid to the fluctuations of the gauge field. It is shown
that the mechanism, in which these gauge fluctuations affect the phase
transition order and other phase transition properties varies with the
variation of spatial dimensionality $D$. The problem for the experimental
confirmation of theoretical predictions about the order of phase transitions in
gauge systems is discussed. Related topics: gauge effects on the critical
behavior of unconventional superconductors, disorder, quantum fluctuations in a
close vicinity of ultra-low phase transition temperatures, are also briefly
discussed.

5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn