Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shapiro Delays at the Quadrupole Order for Tests of the No-Hair Theorem
  Using Pulsars around Spinning Black Holes   One avenue for testing the no-hair theorem is obtained through timing a
pulsar orbiting close to a black hole and fitting for quadrupolar effects on
the time-of-arrival of pulses. If deviations from the Kerr quadrupole are
measured, then the no-hair theorem is invalidated. To this end, we derive an
expression for the light travel time delay for a pulsar orbiting in a
black-hole spacetime described by the Butterworth-Ipser metric, which has an
arbitrary spin and quadrupole moment. We consider terms up to the quadrupole
order in the black-hole metric and derive the time-delay expression in a closed
analytic form. This allows for fast computations that are useful in fitting
time-of-arrival observations of pulsars orbiting close to astrophysical black
holes.

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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga