Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Birefringent Rydberg Dark Matter from Cosmic Dust   A recently published study of dark matter in distant galaxies has found a
direct interaction between unknown dark matter particles and ordinary galactic
baryonic matter. It is proposed here that the dark matter is Rydberg Matter
composed of water nanoclusters ejected from abundant amorphous water-ice-coated
cosmic dust, leading to non-gravitational interactions with ordinary matter.
This may also clarify recently observed CMB birefringence, suggesting possible
new physics such as quintessence.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph