Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Organization and instabilities of entangled active polar filaments   We study the dynamics of an entangled, isotropic solution of polar filaments
coupled by molecular motors which generate relative motion of the filaments in
two and three dimensions. We investigate the stability of the homogeneous state
for constant motor concentration taking into account excluded volume and
entanglement. At low filament density the system develops a density
instability, while at high filament density entanglement effects drive the
instability of orientational fluctuations.

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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom