Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Dark-Disk Universe   We point out that current constraints on dark matter imply only that the
majority of dark matter is cold and collisionless. A subdominant fraction of
dark matter could have much stronger interactions. In particular, it could
interact in a manner that dissipates energy, thereby cooling into a
rotationally-supported disk, much as baryons do. We call this proposed new dark
matter component Double-Disk Dark Matter (DDDM). We argue that DDDM could
constitute a fraction of all matter roughly as large as the fraction in
baryons, and that it could be detected through its gravitational effects on the
motion of stars in galaxies, for example. Furthermore, if DDDM can annihilate
to gamma rays, it would give rise to an indirect detection signal distributed
across the sky that differs dramatically from that predicted for ordinary dark
matter. DDDM and more general partially interacting dark matter scenarios
provide a large unexplored space of testable new physics ideas.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci