Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universality classes of order parameters composed of many body bound
  states   This theoretical paper discusses microscopic models giving rise to special
types of order in which conduction electrons are bound together with localized
spins to create composite order parameters. It is shown that composite order is
related to the formation of a spin liquid with gapped excitations carrying
quantum numbers which are a fraction of those of electron. These spin liquids
are special in the sense that their formation necessarily involves spin degrees
of freedom of both the conduction and the localized electrons. A detailed
description of such spin liquid states is presented with a special emphasize on
a demonstration of their robustness against local perturbations preserving the
Lie group symmetry and the translational invariance.

3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas