Question #189694

Consider the 2-dimensional phase space R^2. Find the most general canonical transformation of this phase space,of the form Q=Q(q,p)=f(q)+g(p)

P=P(q,p)=c[f(q)+h(p)] where f,g and h are differentiable real-valued functions


1
Expert's answer
2021-05-06T19:12:58-0400

Given equations are,

Q=Q(q,p)=f(q)+g(p)Q=Q(q,p)=f(q)+g(p)


P=P(q,p)=c[f(q)+h(p)]P=P(q,p)=c[f(q)+h(p)]


Q˙=Q(p)dQ(q)dq+Q(q)dQ(p)dq\dot{Q}=Q(p)\frac{dQ(q)}{dq}+Q(q)\frac{dQ(p)}{dq}


=f(q)+g(p)=f'(q)+g'(p)


P˙=P(p)d(P(p))dp+P(q)dP(q)dp\dot{P}=P(p)\frac{d(P(p))}{dp}+P(q)\frac{dP(q)}{dp}


=c[f(q)+h(p)]=c[f'(q)+h'(p)]



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