Mathematics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..124s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 124 (SEE N87-23341 16-91)
Mathematics
Density Wave Model, Hamiltonian Functions, Nonlinearity, Planetary Rings, Saturn (Planet), Transformations (Mathematics), Variational Principles, Wentzel-Kramer-Brillouin Method
Scientific paper
The derivation of a Hamiltonian field theory for nonlinear density waves in Saturn's rings is discussed. Starting with a Hamiltonian for a discrete system of gravitating streamlines, an averaged Hamiltonian is obtained by successive applications of Lie transforms. The transformation may be carried out to any desired order in q, where q is the nonlinearity parameter defined in the work of Shu, et al (1985) and Borderies et al (1985). Subsequent application of the Wentzel-Kramer-Brillouin Method approximation yields an asymptotic field Hamiltonian. Both the nonlinear dispersion relation and the wave action transport equation are easily derived from the corresponding Lagrangian by the standard variational principle.
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