Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Timing Noise in Pulsars and Magnetars and the Magnetospheric Moment of
  Inertia   We examine timing noise in both magnetars and regular pulsars, and find that
there exists a component of the timing noise with strong magnetic field
dependence above B ~ 10^{12.5} G. The dependence of the timing noise floor on
the magnetic field is also reflected in the smallest observable glitch size. We
find that magnetospheric torque variation cannot explain this component of
timing noise. We calculate the moment of inertia of the magnetic field outside
of a neutron star and show that this timing noise component may be due to
variation of this moment of inertia, and could be evidence of rapid global
magnetospheric variability.

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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess