Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Klein-Gordon equation in $q$-deformed Euclidean space   We introduce $q$-versions of the Klein-Gordon equation in the
three-dimensional $q$-deformed Euclidean space. We determine plane wave
solutions to our $q$-deformed Klein-Gordon equations. We show that these plane
wave solutions form a complete orthogonal system. We discuss the propagators of
our $q$-deformed Klein-Gordon equations. We derive continuity equations for the
charge density, the energy density, and the momentum density of a $q$-deformed
spin-zero particle.

24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th