Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalized frequency shift of a Wannier exciton in a one-dimensional
  system   The radiative frequency shift of superradiant exciton in a one-dimensional
system is calculated. It is shown that a finite frequency shift can be obtained
after proper renormalization. The value of the shift is inversely proportional
to the factor $\frac{\lambda}{d}$, where $\lambda $ is the wavelength of the
emitted photon and $d$ is the lattice spacing.

8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol