User K. Pull - Physics Stack Exchange

7 votes

2 answers

1k views

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

asked Oct 31, 2023 at 22:30

4 votes

1 answer

113 views

What is the gravitational field of an accelerated particle?

asked Dec 9, 2023 at 20:15

3 votes

1 answer

69 views

Is this a contradiction in Schwinger's measurement algebra?

asked Jan 5 at 22:49

2 votes

2 answers

2k views

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

asked Oct 1, 2023 at 20:50

2 votes

1 answer

118 views

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

asked Oct 3, 2023 at 18:26

2 votes

2 answers

94 views

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

asked Oct 29, 2023 at 21:42

1 vote

2 answers

169 views

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

asked Jan 25 at 7:18

1 vote

0 answers

161 views

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

asked Oct 2, 2023 at 21:43

1 vote

1 answer

95 views

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

asked Oct 3, 2023 at 6:45

1 vote

0 answers

35 views

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

asked Dec 8, 2021 at 11:50

1 vote

0 answers

36 views

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

asked Sep 27, 2023 at 10:46

1 vote

0 answers

28 views

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

asked Oct 8, 2023 at 14:33

0 votes

1 answer

241 views

Is proper time the affine parameter in general relativity?

asked Oct 10, 2023 at 12:33

0 votes

0 answers

51 views

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

asked Oct 19, 2023 at 21:28

0 votes

0 answers

34 views

Continuity equation in curved space-time: a point particle

asked Nov 12, 2023 at 19:47

0 votes

1 answer

82 views

Can there be an electron without photons?

asked Jan 23 at 9:11

0 votes

0 answers

24 views

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

asked Dec 28, 2023 at 14:02

0 votes

1 answer

79 views

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

asked Sep 27, 2023 at 12:46

0 votes

0 answers

61 views

Is this the right way to think about accelerated observers?

asked Sep 27, 2023 at 18:15

0 votes

1 answer

58 views

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

asked Sep 19, 2023 at 16:23

0 votes

1 answer

54 views

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

asked Sep 22, 2023 at 12:43

0 votes

0 answers

53 views

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

asked Oct 3, 2023 at 20:01

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22 Questions

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

What is the gravitational field of an accelerated particle?

Is this a contradiction in Schwinger's measurement algebra?

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

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

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

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

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

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

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

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

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

Is proper time the affine parameter in general relativity?

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

Continuity equation in curved space-time: a point particle

Can there be an electron without photons?

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

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

Is this the right way to think about accelerated observers?

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

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

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