Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cyclotron frequency and the quantum clock   We discuss the corrections to the orbital period of a particle in a constant
magnetic field, driven by the model of noncommutative geometry recently
associated to a quantum clock. The effects are extremely small, but in
principle detectable.

1
The categories of this paper are: cs
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom