Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FRBs and dark matter axions   We have proposed a model of a progenitor of fast radio bursts (FRBs): The
FRBs are emitted by electrons in atmospheres of neutron stars when neutron
stars collide with dark matter axion stars. We reexamine the model by taking
account of the tidal forces of the neutron stars. The axion stars are distorted
by the forces so that they become like long sticks when they are close to the
neutron stars. Although the tidal forces fairly distort the axion stars, our
model is still consistent with present observations. We explain a distinctive
feature of our model that the FRBs are not broadband, but narrowband. We also
show that two-component FRBs may arise when the axion stars collide with binary
neutron stars. FRBs would most frequently arise in centers of galaxies since
the dark matter concentrates in the centers.

31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat