Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of quantum motion in regular systems: a uniform semiclassical
  approach   We study the stability of quantum motion of classically regular systems in
presence of small perturbations. Onthe base of a uniform semiclassical theory
we derive the fidelity decay which displays a quite complexbehaviour, from
Gaussian to power law decay $t^{-\alpha}$ with $1 \le \alpha \le 2$.
Semiclassical estimates are given for the time scales separating the different
decaying regions and numerical results are presented which confirm our
theoretical predictions.

26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
19
The categories of this paper are: eess
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol