Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical shear instability   The dynamical shear instability is an important mixing process in the
advanced stages of the evolution of massive stars. We calculated different
models of 15 Mo with an initial rotational velocity, v(rot,ini)= 300 km/s to
investigate its efficiency. We found that the dynamical shear instability has a
timescale shorter than Oxygen burning timescale and that it slightly enlarges
the convective zones and smoothens the omega gradients throughout the
evolution.
  However, its effect is too localized to slow down the core of the star.

22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex