Ambiguities in the energy-momentum tensor
102564
Energy-momentum tensor transformation
44239
Why the extra term $\frac{1}{2}(\partial_{\rho}A^{\rho})^2$ in the photon Lagrangian?
26736
Reason for vanishing of the covariant derivative of energy-momentum tensor of matter in general relativity
83341
How can Planck units be consistent with conflicting dimensions of mass?
4789
Apparent Violation of Newton's $3^{\text{rd}}$ Law and the Conservation of Momentum (and Angular Momentum) For a Pair of Charged Particles
26959
Why doesn't the uncertainty principle contradict the existence of definite-angular momentum states?
137061
Understanding the different kinds of mass in gravity
48192
Staggered Indices ($\Lambda^\mu{}_\nu$ vs. $\Lambda_\mu{}^\nu$) on Lorentz Transformations
155208
Why aren't Christoffel symbols tensors? - asked from a fibre bundle perspective
122474
Inconsistency with partial derivatives as basis vectors?
102665
Why the sudden fascination with tensors?
71820
Intuitive explanation of why momentum is the Fourier transform variable of position?
87800
Covariant derivative ambiguity
57961
Some doubts about photons
94230
I want to understand a trick in the derivation of the Schwinger-Dyson equations
38613
Intuitive understanding of the elements in the stress-energy tensor
104244
Is the Momentum Operator a Postulate?