Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pair creation in electric fields, renormalization, and backreaction   We consider pair production phenomena in spatially homogeneous strong
electric fields. We focus on spinor QED in two-dimensions and discuss the
potential ambiguity in the adiabatic order assignment for the electromagnetic
potential required to fix the renormalization subtractions. This ambiguity can
be univocally fixed by imposing, at the semiclassical level, stress-energy
conservation when both electric and gravitational backgrounds are present.

17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat