Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase-diagram and quasiparticles of a lattice SU(2) scalar-fermion model
  in (2+1) dimensions   The phase diagram at zero temperature of a lattice SU(2) scalar-fermion model
in (2+1) dimensions is studied numerically and with Mean-Field methods. Special
attention is devoted to the strong coupling regime. We have developed a new
method to adaptate the Hybrid Monte Carlo algorithm to the O(3) non-linear
$\sigma$ model constraint. The charged excitations in the various phases are
studied at the Mean-Field lev el. Bound states of two charged fermions are
found in a strongly coupled {\it paramagnetic} phase. On the other hand, in the
strongly coupled antiferromagnetic phase fermionic excitations around momenta
$(\pm\frac{\pi}{2},\pm\frac{\pi}{2},\pm\frac{\pi}{2})$ emerge.

34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
2
The categories of this paper are: math