Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodic travelling waves in convex Klein-Gordon chains   We study Klein-Gordon chains with attractive nearest neighbour forces and
convex on-site potential, and show that there exists a two-parameter family of
periodic travelling waves (wave trains) with unimodal and even profile
functions. Our existence proof is based on a saddle-point problem with
constraints and exploits the invariance properties of an improvement operator.
Finally, we discuss the numerical computation of wave trains.

16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat