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Why does spin appear in quantum systems but not classical systems?
Apr 25, 2021
Does Newtonian $F=ma$ imply the least action principle in mechanics?
Apr 25, 2021
Derive canonical commutation relations from Schwingers principle
Apr 25, 2021
In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?
Apr 25, 2021
How to calculate second-order variations of an action?
Apr 25, 2021
What constitutes a symmetry for Noether's Theorem?
Apr 25, 2021
Is the Lagrangian approach essentially a 'theory of everything'?
Apr 25, 2021
How to determine the Lagrangian's "true" explicit dependence on time?
Apr 25, 2021
What is the purpose of emphasizing that an action is invariant under diffeomorphism?
Apr 25, 2021
Polyakov From Nambu-Goto Directly, for Strings?
Apr 25, 2021
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