Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modulation effect in multiphoton pair production   We investigate the electron-positron pair production process in an
oscillating field with modulated amplitude in quantum kinetic formalism. By
comparing the number density in field with and without modulation, we find that
the pair production rate can be enhanced by several orders when the photon
energy just reach the threshold with the help of shifted frequency due to
modulation. We also detect the same effect in a pulse train with subcycle
structure. We demonstrate that the frequency threshold can be lowered by
frequency of pulse-train due to modulation effect. We also find that the
momentum distribution for $N$-pulse train can reach $N^2$ times the single
pulse at the maximum value and the number density as a function of pulse number
follows the power laws with index $1.6$ when the modulation effect is
maximized.

30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
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The categories of this paper are: stat
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an