Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic quantum mechanics of a Proca particle in Riemannian
  spacetimes   Relativistic quantum mechanics of a Proca (spin-1) particle in Riemannian
spacetimes is constructed. Covariant equations defining electromagnetic
interactions of a Proca particle with the anomalous magnetic moment and the
electric dipole moment in Riemannian spacetimes are formulated. The
relativistic Foldy-Wouthuysen transformation with allowance for terms
proportional to the zero power of the Planck constant is performed. The
Hamiltonian obtained agrees with the corresponding Foldy-Wouthuysen
Hamiltonians derived for scalar and Dirac particles and with their classical
counterpart. The unification of relativistic quantum mechanics in the
Foldy-Wouthuysen representation is discussed.

1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph