Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relating Noncommutative SO(2,3) Gravity to the Lorentz-Violating
  Standard-Model Extension   We consider a model of noncommutative gravity that is based on a spacetime
with broken local SO(2,3) symmetry. We show that the torsion-free version of
this model is contained within the framework of the Lorentz-violating
Standard-Model Extension. We analyze in detail the relation between the
torsion-free, quadratic limits of the broken SO(2,3) model and the
Standard-Model Extension. As part of the analysis,we construct the relevant
geometric quantities to quadratic order in the metric perturbation around a
flat background.

2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga