Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on fall-back disks in radio pulsars and anomalous X-ray
  pulsars   Calculations have been made of fall-back disk heating by the pulsar wind as
distinct from the soft X-rays emitted by the neutron-star surface. The relation
between these heating rates and measured near-infrared fluxes in the K and Ks
bands places severe constraints on the inner radii of any fall-back disks that
may be present in radio pulsars and in some anomalous X-ray pulsars. The lower
limits found are so large that the disks concerned can have no significant
effect on pulsar spin-down.

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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn