Lagrangean stability of slow dynamos in compact 3D Riemannian manifolds

Details Lagrangean stability of slow dynamos in compact 3D Riemannian manifolds Lagrangean stability of slow dynamos in compact 3D Riemannian manifolds

2007-11-07

arxiv.org/abs/0711.1166v1

Astronomy and Astrophysics

Astrophysics

Departamento de Fisica Teorica-IF-UERJ-Brasil

Scientific paper

Modifications on a recently introduced fast dynamo operator by Chiconne et al [Comm Math Phys 173, 379 (1995)] in compact 3D Riemannian manifolds allows us to shown that slow dynamos are Lagrangean stable, in the sense that the sectional curvature of the Riemann manifold vanishes. The stability of the holonomic filament in this manifold will depend upon the sign of the second derivative of the pressure along the filament and in the non-holonomic case, to the normal pressure of the filament. Lagrangean instability is also investigated in this case and again an dynamo operator can be defined in this case. Negative curvature (Anosov flows) dynamos are also discussed in their stability aspects.

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