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Analytical Mechanics for Relativity and Quantum Mechanics$
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Oliver Johns

Print publication date: 2011

Print ISBN-13: 9780191001628

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780191001628.001.0001

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Hamilton'S Principle and Noether's Theorem

Hamilton'S Principle and Noether's Theorem

Chapter:
(p.327) 15 Hamilton'S Principle and Noether's Theorem
Source:
Analytical Mechanics for Relativity and Quantum Mechanics
Author(s):

Oliver Davis Johns

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780191001628.003.0015

This chapter presents extended forms of Hamilton's Principle and the phase space Hamilton's principle based on the extended Lagrangian and Hamiltonian methods. Hamilton's Principle has already been treated in the context of traditional Lagrangian and Hamiltonian mechanics. Noether's theorem, a method for using symmetries of the extended Lagrangian to identify quantities that are conserved during the motion of the system, is also presented here. Noether's theorem is a powerful technique for discovering conserved quantities in complex Lagrangian systems. The chapter presents the basics of the method in the simple context of Lagrangian systems with a finite number of degrees of freedom. Both the traditional and the extended Hamilton's Principles are an application of the calculus of variations to mechanics. The traditional Hamilton's Principle uses the coordinate parametric method, while the extended Hamilton's Principle uses the general parametric method.

Keywords:   phase space, Hamilton's Principle, Noether's theorem, conserved quantities, complex Lagrangian systems

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