Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Paraxial wave function and Gouy phase for a relativistic electron in a
  uniform magnetic field   A connection between relativistic quantum mechanics in the Foldy-Wouthuysen
representation and the paraxial equations is established for a Dirac particle
in external fields. The paraxial form of the Landau eigenfunction for a
relativistic electron in a uniform magnetic field is determined. The obtained
wave function contains the Gouy phase and significantly approaches to the
paraxial wave function for a free electron.

4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex