Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acceleration of charged particles in rotating magnetized star   Charged particles at the crust of compact stars may be ejected and
accelerated by the electric field generated due to the rotation of the
magnetized star. For neutron or hybrid stars, the negatively charged particles
are usually electrons, and the positively charged particles are mainly protons
and Iron. Whereas the existence of strange stars also includes the possibility
of ejection of strangelets from the star surface. The flux of such strangelets
emitted from all known pulsars is in the range of $10^9-10^{10}$ GeV.
Therefore, such massive strangelets can be one of the candidates for the
sources of the highest-energy cosmic rays that have still eluded us. Our model
proposes a possible origin of these ultra high energy cosmic rays.

21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an