Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pure electric Penrose and super-Penrose processes in the flat space-time   Let a particle move in the flat space-time under the action of the electric
potential. If it decays to two fragments, the energy of debris can be larger
than the original energy and, moreover, the efficiency of such a process can be
unbounded. This effect can be considered as a limit of the Denardo-Ruffini
process near the Reissner-Nordstr\"{o}m black hole when the gravitational
constant and/or black hole mass tend to zero. There are scenarios in which the
energy of debris at infinity is much larger than the initial one. Comparison
with other close but distinct effects is discussed.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin