Constrained systems and the Clairaut equation

Details Constrained systems and the Clairaut equation Constrained systems and the Clairaut equation

2008-04-17

arxiv.org/abs/0804.2673v3

In Proceedings of 5th Mathematical Physics Meeting: "Summer School in Modern Mathematical Physics", 6 - 17 July 2008, Belgrade

Physics

Mathematical Physics

11 pages, in v.3 typos corrected

Scientific paper

An extension of the Legendre transform to non-convex functions with vanishing Hessian as a mix of envelope and general solutions of the Clairaut equation is proposed. Applying this to systems with constraints, the procedure of finding a Hamiltonian for a degenerate Lagrangian is just that of solving a corresponding Clairaut equation with a subsequent application of the proposed Legendre-Clairaut transformation. In this way the unconstrained version of Hamiltonian equations is obtained. The Legendre-Clairaut transformation presented is involutive. We demonstrate the origin of the Dirac primary constraints, along with their explicit form, and this is done without using the Lagrange multiplier method.

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