Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Dynamical Systems Approach to a Bianchi Type I Viscous
  Magnetohydrodynamic Model   We use the expansion-normalized variables approach to study the dynamics of a
non-tilted Bianchi Type I cosmological model with both a homogeneous magnetic
field and a viscous fluid. In our model the perfect magnetohydrodynamic
approximation is made, and both bulk and shear viscous effects are retained.
The dynamical system is studied in detail through a fixed-point analysis which
determines the local sink and source behavior of the system. We show that the
fixed points may be associated with Kasner-type solutions, a flat universe FLRW
solution, and interestingly, a new solution to the Einstein Field equations
involving non-zero magnetic fields, and non-zero viscous coefficients. It is
further shown that for certain values of the bulk and shear viscosity and
equation of state parameters, the model isotropizes at late times.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
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The categories of this paper are: econ
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: eess
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an