homework assignment 4 canonical transformations 1...
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Homework Assignment 4Canonical TransformationsDue Tuesday, Feb. 23, 2010
1. Consider the canonical transformation from {p1, p2, q1, q2} → {P1, P2, Q1, Q2} such that
Q1 = q2
1, Q2 =
q2
cos(p2),
P1 =p1cos(p2) − 2q2
2q1cos(p2), P2 = sin(p2) − 2q1.
a) Show the following is true for the Poisson Brackets: [Qi, Pj ]pq = δij , [Qi, Qj ]pq = 0, and [Pi, Pj ]pq = 0.b) Find a generating function for this transformation.
2. Show that the following transformation is canonical by showing that the symplectic condition is satisfied.
Q = ln
(
1
qsin(p)
)
, P = q cot(p).
3. Find a generating function for the following transformation.
Q1 = q1, P1 = p1 − 2p2
Q2 = p2, P2 = −2q1 − q2
Hint: A combination of two types of generating functions will work. Note that the transformation is a combi-nation of the identity transformation and the exchange transformation (which we went over in class).
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