- #1
irycio
- 97
- 1
Hi!
Our TA told us, that it may be not always possible to change lagrangian into hamiltonian using Legendre transformation. As far as I'm concerned the only such possibility is that we can not substitute velocity (dx/dt) with momenta and location(s). And so, we've been tryging to come up with an idea of such terms in lagrangian that would not allow us to calculate the velocity explicitly. Now, of course, one can think of terms like [tex] (\frac{dx}{dt})^5+\alpha (\frac{dx}{dt})^4+...[/tex] and so on, but they do not seem very physical to me ;).
And hence my question-do you guys know any examples of real-life :D lagrangians that wouldn't be subject to Legendre transformation?
Cheers and Mery Christmas :D
Our TA told us, that it may be not always possible to change lagrangian into hamiltonian using Legendre transformation. As far as I'm concerned the only such possibility is that we can not substitute velocity (dx/dt) with momenta and location(s). And so, we've been tryging to come up with an idea of such terms in lagrangian that would not allow us to calculate the velocity explicitly. Now, of course, one can think of terms like [tex] (\frac{dx}{dt})^5+\alpha (\frac{dx}{dt})^4+...[/tex] and so on, but they do not seem very physical to me ;).
And hence my question-do you guys know any examples of real-life :D lagrangians that wouldn't be subject to Legendre transformation?
Cheers and Mery Christmas :D