Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-strong Elelctric Fields and Vacuum Breakdown: Search for an
  Astrophysical Scenario   In some models of $\gamma$-ray bursts super-strong electric fields ($E\sim
10^{14} {\rm statvolt cm}^{-1}$) have been surmized. Such large fields may
provide copious pair production through vacuum polarization. Here we examine
various astrophysical scenarios where huge electric field can be present. It is
shown that when the conditions for quantistic vacuum breakdown are met, pair
creation through conventional processes is likely to be always more important.
Although of great physical interest, quantum pair production seems therefore of
little astrophysical relevance.

9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph