Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal Properties of the Higgs Resonance in (2+1)-Dimensional U(1)
  Critical Systems   We present spectral functions for the magnitude squared of the order
parameter in the scaling limit of the two-dimensional superfluid to Mott
insulator quantum phase transition at constant density, which has emergent
particle-hole symmetry and Lorentz invariance. The universal functions for the
superfluid, Mott insulator, and normal liquid phases reveal a low-frequency
resonance which is relatively sharp and is followed by a damped oscillation (in
the first two phases only) before saturating to the quantum critical plateau.
The counterintuitive resonance feature in the insulating and normal phases
calls for deeper understanding of collective modes in the strongly coupled
(2+1)-dimensional relativistic field theory. Our results are derived from
analytically continued correlation functions obtained from path-integral Monte
Carlo simulations of the Bose-Hubbard model.

22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys