Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Repeating Fast Radio Bursts from Collapses of the Crust of a Strange
  Star   Strange stars (SSs) are compact objects made of deconfined quarks. It is hard
to distinguish SSs from neutron stars as a thin crust composed of normal
hadronic matter may exist and obscure the whole surface of the SS. Here we
suggest that the intriguing repeating fast radio bursts (FRBs) are produced by
the intermittent fractional collapses of the crust of an SS induced by
refilling of accretion materials from its low-mass companion. The
periodic/sporadic/clustered temporal behaviors of FRBs could be well understood
in our scenario. Especially, the periodicity is attributed to the modulation of
accretion rate through the disk instabilities. To account for a $\sim 16$-day
periodicity of the repeating FRB source 180916.J0158+65, a Shakura-Sunyaev disk
with a viscosity parameter of $\alpha \simeq 0.004$ and an accretion rate of
$\simeq 3 \times 10^{16}$~g~s$^{-1}$ in the low state is invoked. Our scenario,
if favored by future observations, will serve as indirect evidence for the
strange quark matter hypothesis.

35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys