Most General form of Canonical Transformation

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SUMMARY

The discussion focuses on finding the most general form of canonical transformations represented by the equations Q = f(q) + g(p) and P = c[f(q) + h(p)], where f, g, and h are differential functions and c is a non-zero constant. The key to solving this problem lies in evaluating the Poisson brackets, which must satisfy the conditions {Q,Q} = {P,P} = 0 and {Q,P} = 1 to ensure a valid canonical transformation. The participant expresses difficulty in deriving the functions from the general formula while having successfully established relationships for specific cases.

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  • Understanding of canonical transformations in Hamiltonian mechanics
  • Familiarity with Poisson brackets and their properties
  • Knowledge of differential functions and their applications in physics
  • Basic grasp of generalized coordinates and conjugate momentum
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kolawoletech
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How do I go about finding the most general form of the canonical transformation of the form
Q = f(q) + g(p)
P = c[f(q) + h(p)]
where f,g and h are differential functions and c is a constant not equal to zero. Where (Q,P) and (q,p) represent the generalised cordinates and conjugate momentum in the new and old system
 
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Isn't this "homework" of some kind? You should post it in the Homework and Coursework section! Anyway, here's some hint:

I'd try to determine constraints on the functions by evaluating the Poisson brackets which must be
$$\{Q,Q\}=\{P,P \}=0, \quad \{Q,P \}=1$$
in order to have a canonical transformation.
 
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I am done all that with certain kinds of relationship between (Q,P) and (q,p) but I am unable to do so with this general formula that does not give the function itself
 

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