Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular momentum conservation and torsional oscillations in the Sun and
  solar-like stars   The solar torsional oscillations, i.e., the perturbations of the angular
velocity of rotation associated with the eleven-year activity cycle, are a
manifestation of the interaction among the interior magnetic fields, amplified
and modulated by the solar dynamo, and rotation, meridional flow and turbulent
thermal transport. Therefore, they can be used, at least in principle, to put
constraints on that interaction. Similar phenomena are expected to be observed
in solar-like stars and can be modelled to shed light on analogous interactions
in different environments. The source of the torsional oscillations is
investigated by means of a model for the angular momentum transport within the
convection zone. A description of the torsional oscillations is introduced,
based on an analytical solution of the angular momentum equation in the
mean-field approach. It provides information on the intensity and location of
the torques producing the redistribution of the angular momentum within the
convection zone of the Sun along the activity cycle. The method can be extended
to solar-like stars for which some information on the time-dependence of the
differential rotation is becoming available. Illustrative applications to the
Sun and solar-like stars are presented. Under the hypothesis that the solar
torsional oscillations are due to the mean-field Lorentz force, the mean
amplitude of the Maxwell stresses and the phase relationship between poloidal
and toroidal field components are obtained. Our preliminary results show the
capability of the proposed approach to constrain the amplitude, phase and
location of the perturbations leading to the observed torsional oscillations.

1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin