Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent versus Incoherent Dynamics during Bose-Einstein Condensation in
  Atomic Gases   We review and extend the theory of the dynamics of Bose-Einstein condensation
in weakly interacting atomic gases. We present in a unified way both the
semiclassical theory as well as the full quantum theory. This is achieved by
deriving a Fokker-Planck equation that incorporates both the coherent and
incoherent effects of the interactions in a dilute Bose gas. In first instance
we focus our attention on the nonequilibrium dynamics of a homogeneous Bose gas
with a positive interatomic scattering length. After that we discuss how our
results can be generalized to the inhomogeneous situation that exists in the
present experiments with magnetically trapped alkali gases, and how we can deal
with a negative interatomic scattering length in that case as well. We also
show how to arrive at a discription of the collective modes of the gas that
obeys the Kohn theorem at all temperatures. The theory is based on the
many-body T-matrix approximation throughout, since this approximation has the
correct physical behavior near the critical temperature and also treats the
coherent and incoherent processes taking place in the gas on an equal footing.

32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol