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## Hamilton-Jacobi

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**Time-Dependent Generator**• A generator determines a canonical transformation. • The transform generally changes the form of H. • If time-dependent, the value of H also changes.**The easiest integration for H is if H is independent of all**variables. Select f to give that result Coordinates and momenta are constants of the motion. 2fconstants Independent Hamiltonian**Hamilton-Jacobi Equation**• Hamilton-Jacobi is a partial differential equation. • First order, generally second degree • f+1 independent variables: qj, t • f+1 constants, one additive, others are ak.**Principal Function**• The Lagrangian is directly related to the generator. • Generator f is Hamilton’s principal function since setting one set at t and the other at t1:**The action is defined when H does not involve time.**f is the principal function Additive constant is possible Subsitute to simplify HJ equation. Time-independent H Time variable separates E is not independent Principal Function and Action**Path Equations**• Choose energy symmetrically • Simplifies action relations • Gives f parameterized equations • One can pick one for E. • Path described without time • One equation for location on the path next