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C. Hunter (Florida State U.)
This talk will discuss studies of orbits in simplified models of galaxies which consist of just two components, a disk and a halo. The disk is idealized as razor-thin, though evidence shows that this simplifying assumption is not critical. The presence of the disk causes many more resonances than have been found in similar smooth potentials. These resonances grow at relatively modest values of energy, overlap, and give rise to many stochastic orbits. A significant range of regular orbits remain and show smooth KAM curves, even though the discontinuous potential due to the razor-thin disk means that current versions of the KAM theorem do not apply.
This work has been supported by NSF through grant DMS-0104751.
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Bulletin of the American Astronomical Society, 35 #4
© 2003. The American Astronomical Soceity.