Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmologically Screwy Light   We present evidence for a new phenomenon in the propagation of
electromagnetic radiation across the Universe, a corkscrew rotation of the
plane of polarization not accounted for by conventional physics.

14
The categories of this paper are: math-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int