Does Friedmann fluid equation prove that energy of the fluid is not conserved?
2377
Is the total energy of the universe zero?
155640
Why is the laboratory frame energy always greater than the center of mass frame energy?
10953
Elementary argument for conservation laws from symmetries *without* using the Lagrangian formalism
150707
Prove the statement 'World is not flat'
68027
Conservation of Energy vs Expansion of Space
110621
2nd law of thermodynamics' violation?
86439
Why do we ignore rotational energy in monatomic gases?
64247
Noether Theorem and Energy conservation in classical mechanics
103009
$E=mc^2$ resembles non-relativistic kinetic energy formula $E_K = \frac{1}{2}mv^2$?
111394
Does conservation of momentum really imply Newton's third law?
144948
Why doesn't an electromagnetic wave violate conservation of energy?
100694
Kinetic energy in work energy theorem
131016
Question about Klein-Gordon field Lagrangian
8077
Photons in expanding space: how is energy conserved?
53170
Energy conservation in General Relativity
15502
Does non-mass-energy generate a gravitational field?
29340
Why does no physical energy-momentum tensor exist for the gravitational field?