Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Quantum Double Pendulum: a Study of an Autonomous Classically
  Chaotic Quantum System   A numerical study of the quantum double pendulum is conducted. A suitable
quantum scaling is found which allows to have as the only parameters the ratios
of the lengths and masses of the two pendula and a (quantum) gravity parameter
containing Planck's constant. Comparison with classical and semiclassical
results is used to understand the behaviour of the energy curves of the levels,
to define regimes in terms of the gravity parameter, and to classify the
(resonant) interactions among levels by connecting them to various classical
phase space structures (resonance islands).

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics