Generating function, hamiltonian dynamics

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SUMMARY

The discussion centers on the use of a generating function, specifically F = a * cot(Q), to perform a canonical transformation from the variables (p, q) to (P, Q). Participants highlight that the generating function must depend on both old and new variables to facilitate the transformation. The absence of p and q in the function F raises concerns about its validity in establishing the required contact transformation.

PREREQUISITES
  • Understanding of canonical transformations in Hamiltonian dynamics
  • Familiarity with generating functions in classical mechanics
  • Knowledge of the cotangent function and its properties
  • Basic grasp of variable dependencies in mathematical functions
NEXT STEPS
  • Study the role of generating functions in Hamiltonian mechanics
  • Learn about the conditions for valid canonical transformations
  • Explore examples of generating functions that depend on both old and new variables
  • Investigate the implications of variable dependencies in transformations
USEFUL FOR

Students and researchers in classical mechanics, particularly those studying Hamiltonian dynamics and canonical transformations, will benefit from this discussion.

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Homework Statement



A canonical transformation is made from (p,q) to (P,Q) through a generating function F=a*cot(Q), where 'a' is a constant. Express p,q in terms of P,Q.

Homework Equations





The Attempt at a Solution


A generating function is supposed to be a bridge between (p,q) and (P,Q), right? Now, if there is no functional dependence of F on p or q, that is the old variables, how is one supposed to find out the contact transformation asked for?
 
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yeah that generating function doesn't make sense. It should be F(q,Q) F(p,Q)

it has to be a function of two variables which connect the transformation Which the given does not
 
Thanks a lot! :)
 

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