Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modified light cone condition via vacuum polarization in a time
  dependent field   The appearance of unconventional vacuum properties in intense fields has long
been an active field of research. In this paper the vacuum polarization effect
is investigated via a pump probe scheme of a probe light propagating in the
vacuum excited by two counter-propagating laser beams. The modified light cone
condition of the probe light is derived analytically for the situation that it
passes through the electric/magnetic antinode plane of the pump field. The
derivation does not follow the commonly adopted assumption of treating the pump
field as a constant field. Differences from the conventional light cone
conditions are identified. The implications of the result are discussed with a
consideration of the vacuum birefringence measurement.

24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat