Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing CPT Symmetry   In this talk, I review the possibility that CPT and Lorentz symmetry might be
spontaneously broken in nature by effects originating in a theory beyond the
standard model, and I discuss some existing and future experimental tests.

19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph