Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directional localization of light rays in a periodic array of
  retro-reflector lenses   We show that vertical light rays in almost every periodic array of Eaton
lenses do not leave certain strips of bounded width. The light rays are traced
by leaves of a non-orientable foliation on a singular plane. We study the flow
defined by the induced foliation on the orientation cover of the singular
plane. The behavior of that flow and ultimately our claim for the light rays is
based on an analysis of the Teichm\"uller flow and the Kontsevich-Zorich
cocycle on the moduli space of two branched, two sheeted torus covers in genus
two.

13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn