Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffractive orbits in quantum billiards   We study diffractive effects in two dimensional polygonal billiards. We
derive an analytical trace formula accounting for the role of non-classical
diffractive orbits in the quantum spectrum. As an illustration the method is
applied to a triangular billiard.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-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
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys