Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical comparison of collisionless fluid models: Nonlinear simulations
  of parallel firehose instability   Two different fluid models for collisionless plasmas are compared. One is
based on the classical Chew-Goldberger-Low (CGL) model that includes a finite
Larmor radius (FLR) correction and the Landau closure for the longitudinal
mode. Another one takes into account the effect of cyclotron resonance in
addition to Landau resonance, which is referred to as the cyclotron resonance
closure (CRC) model. While the linear property of the parallel firehose
instability is better described by the CGL model, the electromagnetic ion
cyclotron instability driven unstable by the cyclotron resonance is reproduced
only by the CRC model. Nonlinear simulation results for the parallel firehose
instability performed with the two models are also discussed. Although the
linear and quasilinear isotropization phases are consistent with theory in both
models, long-term behaviors may be substantially different. The final state
obtained by the CRC model may be reasonably understood in terms of the marginal
stability condition. In contrast, the lack of cyclotron damping in the CGL
model makes it rather difficult to predict the long-term behavior with a simple
physical argument. This suggests that incorporating the collisionless damping
both for longitudinal and transverse modes is crucial for a nonlinear fluid
simulation model of collisionless plasmas.

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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
2
The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an