Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density spikes near black holes in self-interacting dark matter halos
  and indirect detection constraints   Self-interacting dark matter (SIDM) naturally gives rise to a cored
isothermal density profile, which is favored in observations of many dwarf
galaxies. The dark matter distribution in the presence of a central black hole
in an isothermal halo develops a density spike with a power law of $r^{-7/4}$,
which is shallower than $r^{-7/3}$ as expected for collisionless dark matter
(CDM). Thus, indirect detection constraints on dark matter annihilations from
the density spike could be relaxed in SIDM. Taking the most dense satellite
galaxy of the Milky Way Draco as an example, we derive upper limits on the
annihilation cross section and the black hole mass for both SIDM and CDM halos.
For the former case, Draco could host an intermediate mass black hole even if
dark matter is composed of thermal relics. We further explore the constraints
from the Milky Way and M87, which host supermassive black holes, and show the
upper limits on the annihilation cross section are significantly weakened in
SIDM. Our results also indicate that the Event Horizon Telescope could provide
a unique test of SIDM spikes.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th