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Angle-action variables for orbits trapped at a Lindblad resonance
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Angle-action variables for orbits trapped at a Lindblad resonance
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The conventional approach to orbit trapping at Lindblad resonances via a pendulum equation fails when the parent of the trapped orbits is too circular. The problem is explained and resolved in the context of the Torus Mapper and a realistic Galaxy model. Tori are computed for orbits trapped at both the inner and outer Lindblad resonances of our Galaxy. At the outer Lindblad resonance, orbits are quasiperiodic and can be accurately fitted by torus mapping. At the inner Lindblad resonance, orbits are significantly chaotic although far from ergodic, and each orbit explores a small range of tori obtained by torus mapping.
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Cited by 1 Pith paper
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GalPort: Investigation of the bar in action-angle space
GalPort computes multi-timescale action-angle variables and orbital classifications for evolving barred galaxy simulations, with specialised bar phase-space analysis tools.
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