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Results tagged with lagrangian-formalism
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user 279836
For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the equations of motion of the system.
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Variation of functional with respect to Lagrange multiplier in QM
So, I am reading a paper on Quantum Brachistochrome and on the second page they say that they are doing a variation w.r.p. $<\phi|$, (which is a lagrange mulriplier) of the following action:
$$ S(\ps …
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QFT: Lagrangian of a field [duplicate]
I just started going through this http://www.damtp.cam.ac.uk/user/tong/qft.html of QFT and I got stuck at the very beginning.
The Lagrangian for the field is derived by:
I think that the second step …