Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamo generated magnetic configurations in accretion discs and the
  nature of quasi-periodic oscillations in accreting binary systems   Magnetic fields are important for accretion disc structure. Magnetic fields
in a disc system may be transported with the accreted matter. They can be
associated with either the central body and/or jet, and be fossil or dynamo
excited in situ. We consider dynamo excitation of magnetic fields in accretion
discs of accreting binary systems in an attempt to clarify possible
configurations of dynamo generated magnetic fields. We first model the entire
disc with realistic radial extent and thickness using an alpha-quenching
non-linearity. We then study the simultaneous effect of feedback from the
Lorentz force from the dynamo-generated field. We perform numerical simulations
in the framework of a relatively simple mean-field model which allows the
generation of global magnetic configurations. We explore a range of
possibilities for the dynamo number, and find quadrupolar-type solutions with
irregular temporal oscillations that might be compared to observed rapid
luminosity fluctuations. The dipolar symmetry models with $R_\alpha<0$ have
lobes of strong toroidal field adjacent to the rotation axis that could be
relevant to jet launching phenomena. We have explored and extended the
solutions known for thin accretion discs.

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The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an