Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effects of three magnons interactions in the magnon-density waves of
  triangular spin lattices   We investigate the magnon-density waves proposed as the longitudinal
excitations in triangular lattice antiferromagnets by including the cubic and
quartic corrections in the large-s expansion. The longitudinal excitation
spectra for the two-dimensional (2D) triangular antiferromagnetic model and
quasi-one dimensional (quasi-1D) antiferromagnetic materials have been obtained
for a general quantum spin number $s$. For the 2D triangular lattice model, we
find a significant reduction (about 40 %) in the energy spectra at the zone
boundaries due to both the cubic and quartic corrections. For the quasi-1D
antiferromagnets, since the cubic term comes from the very weak couplings on
the hexagonal planes, they make very little correction to the energy spectra,
whereas the major correction contribution comes from the quartic terms in the
couplings along the chains with the numerical values for the energy gaps in
good agreement with the experimental results as reported earlier (Ref.~41).

30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga