Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macroscopic quantum behaviour of periodic quantum systems   In this paper we introduce a simple procedure for computing the macroscopic
quantum behaviour of periodic quantum systems in the high energy regime. The
macroscopic quantum coherence is ascribed to a one-particle state, not to a
condensate of a many-particle system; and we are referring to a system of high
energy but with few degrees of freedom. We show that, in the first order of
approximation, the quantum probability distributions converge to its classical
counterparts in a clear fashion, and that the interference effects are strongly
suppressed. The harmonic oscillator provides a testing ground for these ideas
and yields excellent results.

4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph