Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz violation in a uniform gravitational field   We present a method to calculate the nonrelativistic hamiltonian for the
minimal Standard-Model Extension matter sector in a uniform gravitational
field. The resulting hamiltonian coincides with earlier results in the
corresponding limits but it also includes spin-dependent terms that were
previously unknown. The phenomenology associated with this hamiltonian is
briefly discussed.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat