Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex orbital dynamics of a double neutron star system revolving
  around a massive black hole   We investigate the orbital dynamics of hierarchical three-body systems
containing a double neutron star system orbiting around a massive black hole.
These systems show complex dynamical behaviour because of relativistic coupling
between orbits of the neutron stars in the double neutron star system and the
orbit of the double neutron star system around the black hole. The orbital
motion of the neutron stars around each other drives a loop mass current, which
gives rise to gravito-magnetism. Generally, gravito-magnetism involves a
rotating black hole. The hierarchical three-body system that we consider is an
unusual situation in which black hole rotation is not required. Using a
gravito-electromagnetic formulation, we calculate the orbital precession and
nutation of the double neutron star system. These precession and nutation
effects are observable, thus providing probes to the spacetime around black
holes as well as tests of gravito-electromagnetism in the framework of general
relativity.

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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph