Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instability theory of the Navier-Stokes-Poisson equations   The stability question of the Lane-Emden stationary gaseous star
configurations is an interesting problem arising in astrophysics. We establish
both linear and nonlinear dynamical instability results for the Lane-Emden
solutions in the framework of the Navier-Stokes-Poisson system with adiabatic
exponent $6/5 < \gamma < 4/3$.

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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
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The categories of this paper are: dg-ga
7
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: chao-dyn
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
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The categories of this paper are: stat