# Questions tagged [lagrangian-formalism]

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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### A particle without gauge interactions

Please, Can anyone helps me to understand What does it mean a particle with no gauge interactions?
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Consider a system including two generalized coordinates $q_1$ and $q_2$ whose dynamics is supposed to be obtained using first-kind Euler-Lagrange (E-L) formalism $$\frac{d}{dt}\frac{\partial L}{\... 3answers 95 views ### Lagrange formalism in field theory I recently had a discussion with a friend of mine who is like me studying physics. And we might got used to a misconception about the Lagrange-Formalism in field theory. In common field theory books ... 0answers 30 views ### How to see that kinetic energy depends on generalised coor., gen. vel. and time? Let u_{ik} denote the i^{th} component of the position vector of the k^{th} particle. Then kinetic energy of the system of N particles is given by:$$T=\frac{1}{2}\sum^N_{k=1}\sum^3_{i=1}m_k\...
Some textbooks write $$\frac{\delta F_{\mu\nu}}{\delta(\partial_\sigma A_\kappa)}$$ which sort of implies the derivative of a functional. Some other textbooks write  \frac{\partial F_{\mu\nu}}{\...
I'm learning SUSY with Quevedo, Cambridge Lectures on Supersymmetry and Extra Dimensions. Setup: The SUSY transformations of the component fields of a chiral field $\Phi$ are given by (p.41) \begin{...