K. Pull's user avatar
K. Pull's user avatar
K. Pull's user avatar
K. Pull
  • Member for 2 years, 3 months
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7 votes
2 answers
1k views

Why does the Minkowski matrix appear in the free particle action?

4 votes
1 answer
102 views

What is the gravitational field of an accelerated particle?

3 votes
1 answer
67 views

Is this a contradiction in Schwinger's measurement algebra?

2 votes
2 answers
2k views

What kind of coordinate change is needed to make gravity disappear?

2 votes
1 answer
98 views

Does the energy-momentum tensor inside Einstein's field equation include gravitational stress-energy?

2 votes
2 answers
79 views

Why is the density in GR equal to $\rho_0\dfrac{dx^0}{ds}\sqrt{-g}$?

1 vote
0 answers
128 views

Why does general relativity assume that the torsion is equal to zero?

1 vote
1 answer
61 views

Does a metric theory of gravity plus torsion violate the equivalence principle?

1 vote
0 answers
34 views

Is it really necessary for a Hamiltonian density to vary with a total derivative under symmetries?

1 vote
0 answers
36 views

How do 4-vectors change under an "accelerated" Lorentz transformation?

1 vote
0 answers
28 views

Is there an action principle for the dynamics of a relativistic fluid?

0 votes
1 answer
140 views

Is proper time the affine parameter in general relativity?

0 votes
0 answers
48 views

Is $u^{\mu} = \gamma\tfrac{dx^{\mu}}{dt}$ a 4-vector?

0 votes
0 answers
29 views

Continuity equation in curved space-time: a point particle

0 votes
1 answer
80 views

Can there be an electron without photons?

0 votes
0 answers
22 views

Is there some sort of periodicity in the gauge which is responsible for particle number discretization?

0 votes
1 answer
74 views

Can you write a Lorentz transformation as the tensor product of a 4-vector with a 4-covector?

0 votes
0 answers
59 views

Is this the right way to think about accelerated observers?

0 votes
1 answer
57 views

Can you prove the possibility to rewrite any lorentz invariant equation as the component of a 4-tensor?

0 votes
1 answer
53 views

Constant currents do not interact with static charge. Why is that?

0 votes
0 answers
45 views

Can we change coordinates to the Schwarzschild metric and interpret the result as the field corresponding to different matter distributions?

0 votes
2 answers
163 views

How come time does not commute with $i\hbar\dfrac{\partial}{\partial t}$ but it does so with $H$? [duplicate]

-2 votes
0 answers
24 views

If we could measure the number of particles in an isolated area, and they were all stable, would there appear any virtual particles in the future?