Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Origin of Complex Behavior of Linearly Polarized Components in
  Parsec-Scale Jets   Evidence that the magnetic fields of extragalactic jets have a significant
fraction of their energy in a random component is briefly summarized, and a
detailed model of evolving, jet polarization structures is constructed, based
on this picture. The evolving magnetic field structure of an oblique shock
complex that forms in a relativistic jet simulation is explored by using
velocity data from the hydrodynamical simulation to advect an initially random
magnetic field distribution. Radiative transfer calculations reveal that
emission from a propagating region of magnetic field, `ordered' by the shock,
and lying approximately transverse to the flow direction, merges with that from
an evolving sheared region at the flow periphery. If such a flow were barely
resolved, observation would suggest evolution from a somewhat oblique, to a
more longitudinal, magnetic field structure with respect to the flow axis,
while higher resolution observations would infer a component following a
non-linear trajectory, and with a magnetic field orientation that rotates
during evolution. This result highlights the ambiguity in interpreting VLBP
data, and illustrates the importance of simulations in providing a framework
for proper interpretation of such data.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
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The categories of this paper are: physics
30
The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-ex