Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A strange star scenario for the formation of isolated millisecond
  pulsars   According to the recycling model, neutron stars in low-mass X-ray binaries
were spun up to millisecond pulsars (MSPs), which indicates that all MSPs in
the Galactic plane ought to be harbored in binaries. However, about $20\%$
Galactic field MSPs are found to be solitary. To interpret this problem, we
assume that the accreting neutron star in binaries may collapse and become a
strange star when it reaches some critical mass limit. Mass loss and a weak
kick induced by asymmetric collapse during the phase transition (PT) from
neutron star to strange star can result in isolated MSPs. In this work, we use
a population-synthesis code to examine the PT model. The simulated results show
that a kick velocity of $\sim60~{\rm km~s}^{-1}$ can produce $\sim6\times10^3$
isolated MSPs and birth rate of $\sim6.6\times10^{-7} {\rm ~yr}^{-1}$ in the
Galaxy, which is approximately in agreement with predictions from observations.
For the purpose of comparisons with future observation, we also give the mass
distributions of radio and X-ray binary MSPs, along with the delay time
distribution.

26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics