Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pair production by Schwinger and Breit-Wheeler processes in bi-frequent
  fields   Counter-propagating and suitably polarized light (laser) beams can provide
conditions for pair production. Here, we consider in more detail the following
two situations: (i) In the homogeneity regions of anti-nodes of linearly
polarized ultra-high intensity laser beams, the Schwinger process is
dynamically assisted by a second high-frequency field, e.g. by a XFEL beam.
(ii) A high-energy probe photon beam colliding with a superposition of
co-propagating intense laser and XFEL beams gives rise to the laser assisted
Breit-Wheeler process. Prospects of such bi-frequent field constellations with
respect to the feasibility of conversion of light into matter are discussed.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom