Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar Wave Propagation in Random, Amplifying Media: Influence of
  Localization Effects on Length and Time Scales and Threshold Behavior   We present a detailed discussion of scalar wave propagation and light
intensity transport in three dimensional random dielectric media with optical
gain. The intrinsic length and time scales of such amplifying systems are
studied and comprehensively discussed as well as the threshold characteristics
of single- and two-particle propagators. Our semi-analytical theory is based on
a self-consistent Cooperon resummation, representing the repeated
self-interference, and incorporates as well optical gain and absorption,
modeled in a semi-analytical way by a finite imaginary part of the dielectric
function. Energy conservation in terms of a generalized Ward identity is taken
into account.

36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org