Physics – Classical Physics
Scientific paper
2007-01-18
Phys.Rev.Lett.98:234301,2007
Physics
Classical Physics
7 pages TeX, Figure captions, 4 figures (eps). Some clarifications, added references
Scientific paper
10.1103/PhysRevLett.98.234301
We show that Gutzwiller's characterization of chaotic Hamiltonian systems in terms of the curvature associated with a Riemannian metric tensor in the structure of the Hamiltonian can be extended to a wide class of potential models of standard form through definition of a conformal metric. The geodesic equations reproduce the Hamilton equations of the original potential model when a transition is made to the dual manifold, and the geodesics in the dual space coincide with the orbits of the Hamiltonian potential model. We therefore find a direct geometrical description of the time development of a Hamiltonian potential model. The second covariant derivative of the geodesic deviation in this dual manifold generates a dynamical curvature, resulting in (energy dependent) criteria for unstable behavior different from the usual Lyapunov criteria. We discuss some examples of unstable Hamiltonian systems in two dimensions giving, in particular, detailed results for a potential obtained from a fifth order expansion of a Toda lattice Hamiltonian.
Horwitz Lawrence
Levitan Jacob
Lewkowicz Meir
Schiffer Marcelo
Zion Yossi Ben
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