Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological multicritical point in the Toric Code and 3D gauge Higgs
  Models   We report a new type of multicritical point that arises from competition
between the Higgs and confinement transitions in a Z_2 gauge system. The phase
diagram of the 3d gauge Higgs model has been obtained by Monte-Carlo simulation
on large (up to 60^3) lattices. We find the transition lines continue as
2nd-order until merging into a 1st-order line. These findings pose the question
of an effective field theory for a multicritical point involving noncommuting
order parameters. A similar phase diagram is predicted for the 2-dimensional
quantum toric code model with two external fields, h_z and h_x; this problem
can be mapped onto an anisotropic 3D gauge Higgs model.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg