Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory and Tests of CPT and Lorentz Violation   A general Lorentz-violating extension of the standard model of particle
physics, allowing for both CPT-even and CPT-odd effects, is described. Some of
its theoretical aspects and experimental implications are summarized.

26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
23
The categories of this paper are: solv-int