Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observable Effects of Noncommutative Spacetime on the Hydrogen Atom   We present a brief historical introduction to the motivations behind quantum
mechanics and quantum field theory on noncommutative spacetime and provide an
insightful technique, readily accessible to the undergraduate student, to
examine the measurable effects of noncommutative spacetime on the familiar
hydrogen atom. Finally, we compare our results to those derived from more
sophisticated approaches.

32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph