Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On absolute continuity of the spectrum of a d-dimensional periodic
  magnetic Dirac operator   In this paper, for d > 2, we prove the absolute continuity of the spectrum of
a d-dimensional periodic Dirac operator with some discontinuous magnetic and
electric potentials. In particular, for d = 3, electric potentials from Zygmund
classes $L^3\ln ^{1+\delta}L(K)$, $\delta >0$, and also ones with Coulomb
singularities, with constraints on charges depending on the magnetic potential,
are admitted (here K is the fundamental domain of the period lattice).

4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th