Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The energy level shifts and the decay rate of an atom in the presence of
  a conducting wedge   In the present article explicit expressions for the decay rate and energy
level shifts of an atom in the presence of an ideal conducting wedge, two
parallel plates and a half-sheet are obtained in the frame work of the
canonical quantization approach. The angular and radial dependence of the decay
rate for different atomic polarizations of an excited atom and also of the
energy level shifts are depicted and discussed. The consistency of the present
approach in some limiting cases is investigated by comparing the relevant
results obtained here to the previously reported results.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc