How to get "massless" equation of motion from the action of Nordstrom scalar field theory?
45131
Derivation of equations of motion in Nordstrom's theory of scalar gravity?
72721
Do an action and its Euler-Lagrange equations have the same symmetries?
70891
Work done by a homogeneous gravitational field on a system of particles
131016
Question about Klein-Gordon field Lagrangian
157316
Gravitational self-interaction
4421
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
83917
How can I prove that the following Lagrangian is Lorentz-invariant iff the axionic field is a pseudoscalar?
12826
How to calculate scalar curvature Ricci tensor and Christoffel symbols in Mathematica?
44239
Why the extra term $\frac{1}{2}(\partial_{\rho}A^{\rho})^2$ in the photon Lagrangian?
145003
How can a point-like particle "feel" gravity, if locally the curvature of spacetime is always flat?
148463
How do I get the negative sign in the expression for Gravitational Potential Energy?
74367
Newtonian mechanics: massless particles
63402
Euler-Lagrange equation in curved spacetime: how to calculate $\partial \mathcal{L}/\partial(\nabla_\nu A_\mu)$?
137569
Generalising a Dirac Delta function formula in General Relativity
94230
I want to understand a trick in the derivation of the Schwinger-Dyson equations
155913
Lagrangian for free particle in special relativity
71342
Physical interpretation of the Reissner-Nordstrom metric