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New contributions to the Hamiltonian and Lagrangian contact formalisms for dissipative mechanical systems and their symmetries

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arxiv 1907.02947 v3 pith:AWCOYAN7 submitted 2019-07-05 math-ph hep-thmath.MP

classification math-phhep-thmath.MP
keywords contactsystemsdissipativelagrangiandissipationdynamicalformalismshamiltonian
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We provide new insights into the contact Hamiltonian and Lagrangian formulations of dissipative mechanical systems. In particular, we state a new form of the contact dynamical equations, and we review two recently presented Lagrangian formalisms, studying their equivalence. We define several kinds of symmetries for contact dynamical systems, as well as the notion of dissipation laws, prove a dissipation theorem and give a way to construct conserved quantities. Some well-known examples of dissipative systems are discussed.

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  1. Numerical integration in celestial mechanics: a case for contact geometry

    math.NA 2019-09 conditional novelty 6.0 of 10

    All linearly damped Newton equations of a certain broad class are shown to fit a contact-geometry framework, which yields new higher-order geometric integrators with derived error estimates, tested on Kepler, spin-orb...

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