Abstract
The basic theory of dynamical systems is introduced in this chapter. Invariant phase space structures—equilibria, periodic orbits, tori, normally hyperbolic invariant manifolds and stable/unstable manifolds—are defined mainly with graphs produced by numerically solving the equations of motion of 1, 2 and 3 degrees of freedom model Hamiltonian systems. Stability analysis and elementary bifurcations of equilibria and periodic orbits are discussed. The center-saddle, pitchfork, period doubling and complex instability elementary bifurcations encountered in continuation diagrams of equilibria and periodic orbits by varying a parameter in the potential function or the energy of the system are investigated. Methods of analysing non-periodic orbits, regular and chaotic, such as Poincaré surfaces of section, maximal Lyapunov exponent and autocorrelation functions are introduced and explained.
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Notes
- 1.
For general dynamical systems this elementary bifurcation is called saddle-node.
- 2.
To avoid using many symbols we use \((q, p)\) to ascribe both the internal and the normal coordinates and conjugate momenta.
- 3.
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Farantos, S.C. (2014). Dynamical Systems. In: Nonlinear Hamiltonian Mechanics Applied to Molecular Dynamics. SpringerBriefs in Molecular Science(). Springer, Cham. https://doi.org/10.1007/978-3-319-09988-0_3
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