Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Motion of charged particles in a NUTty Einstein-Maxwell spacetime and
  causality violation   We investigate the motion of electrically charged test particles in
spacetimes with closed timelike curves, a subset of the black hole or wormhole
Reissner-Nordstr\"om-NUT spacetimes without periodic identification of time. We
show that, while in the wormhole case there are closed worldlines inside a
potential well, the wordlines of initially distant charged observers moving
under the action of the Lorentz force can never close or self-intersect. This
means that for these observers causality is preserved, which is an instance of
our weak chronology protection criterion.

25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph