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Results tagged with lagrangian-formalism
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user 271784
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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Is there a derivation of the classical free scalar lagrangian?
In my particle physics course notes, I see that the Lagrangian (density) for free scalars is given by
$$
\mathcal{L} = \frac{1}{2} g^{\mu\nu} \partial_\mu\phi \partial_\nu \phi - \frac{1}{2}m^2\phi^2
…
