Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-Varying Lense-Thirring System   We consider bound geodesic orbits of test masses in the exterior
gravitational field of a rotating astronomical source whose proper angular
momentum varies linearly with time. The linear perturbation approach of Lense
and Thirring is herein extended to the nonstationary case. In particular, we
investigate the instability of Lense-Thirring precessing orbits due to the slow
temporal variation of the gravitomagnetic field of the source.

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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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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: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: cond-mat