User Il Guercio

9 votes

2 answers

897 views

Is the tidal force the only real force-like quality of gravity?

asked Apr 5 at 7:01

8 votes

3 answers

806 views

Why does the Weyl tensor not show up in the Einstein field equations?

asked Sep 2, 2023 at 5:09

2 votes

3 answers

450 views

Why does acceleration in special relativity give rise to general relativity (and thus gravity)?

asked Aug 26, 2023 at 16:38

2 votes

1 answer

105 views

Is the equivalence principle violated for photons in the field of an infinite massive plane?

asked Aug 27, 2023 at 14:08

2 votes

1 answer

70 views

How fast do the neutrinos in the neutrino background radiation move through the universe?

asked Jan 23 at 15:08

1 vote

0 answers

114 views

How big was the universe after inflation? [duplicate]

asked Jan 25 at 11:58

1 vote

0 answers

107 views

What means Alan Guth's Free Lunch Principle for the universe?

asked Feb 7 at 22:22

1 vote

1 answer

94 views

Does the Weyl tensor amount to tidal effects of gravity?

asked Apr 5 at 0:28

1 vote

0 answers

93 views

Why do gauge particles with odd spin cause opposite charges to attract, while those with even spin cause them to repel? What's the math behind it?

asked Sep 12, 2023 at 21:05

1 vote

0 answers

148 views

Has the mass of a proton been calculated from current quarks, through the renormalization process?

asked Sep 28, 2023 at 13:51

1 vote

0 answers

78 views

What contributes most to the mass of the proton?

asked Sep 29, 2023 at 10:49

0 votes

0 answers

68 views

How fast must an incompressible ball, with mass $M$ and radius $R$, rotate to form a black hole?

asked Oct 30, 2023 at 13:43

0 votes

0 answers

109 views

How far does a particle fall before it hits the singularity of a black hole?

asked Sep 16, 2023 at 6:59

0 votes

1 answer

87 views

How can the distance to the event horizon, as measured by a tape attached to a falling mass, be reconciled with the mass passing through it?

asked Sep 17, 2023 at 20:15

0 votes

6 answers

203 views

Will the wheels of a relativistically moving train, according to an observer at rest, show friction with the tracks, when decelerating?

asked Aug 28, 2023 at 12:53

0 votes

2 answers

98 views

What will happen with the caterpillars of tank when it accelerates to a relativistic speed? [closed]

asked Aug 29, 2023 at 2:59

0 votes

1 answer

61 views

How is the chirality for the weak interaction conserved for non-relativistic neutrinos?

asked Sep 10, 2023 at 14:33

0 votes

2 answers

128 views

Does an object at rest on Earth accelerate in the timelike base direction?

asked Aug 23, 2023 at 20:15

0 votes

1 answer

69 views

Will a mass $m$ rotating around a black hole with mass $M$ form a new black hole together with $M$, at a close enough distance?

asked Aug 24, 2023 at 12:29

0 votes

1 answer

57 views

Can we see the rest-energy of a mass as its kinetic energy in the $ct$-direction?

asked Aug 25, 2023 at 7:31

0 votes

1 answer

48 views

Question about the derivative of contravariant momentum 4-vector wrt proper time

asked Apr 8 at 13:18

-3 votes

0 answers

88 views

Does a train that moves at relativistic speed and then decelerates to zero speed, seem to expand to an observer at rest near the tracks? [duplicate]

asked Aug 30, 2023 at 5:59

Stack Exchange Network

22 Questions

Is the tidal force the only real force-like quality of gravity?

Why does the Weyl tensor not show up in the Einstein field equations?

Why does acceleration in special relativity give rise to general relativity (and thus gravity)?

Is the equivalence principle violated for photons in the field of an infinite massive plane?

How fast do the neutrinos in the neutrino background radiation move through the universe?

How big was the universe after inflation? [duplicate]

What means Alan Guth's Free Lunch Principle for the universe?

Does the Weyl tensor amount to tidal effects of gravity?

Why do gauge particles with odd spin cause opposite charges to attract, while those with even spin cause them to repel? What's the math behind it?

Has the mass of a proton been calculated from current quarks, through the renormalization process?

What contributes most to the mass of the proton?

How fast must an incompressible ball, with mass $M$ and radius $R$, rotate to form a black hole?

How far does a particle fall before it hits the singularity of a black hole?

How can the distance to the event horizon, as measured by a tape attached to a falling mass, be reconciled with the mass passing through it?

Will the wheels of a relativistically moving train, according to an observer at rest, show friction with the tracks, when decelerating?

What will happen with the caterpillars of tank when it accelerates to a relativistic speed? [closed]

How is the chirality for the weak interaction conserved for non-relativistic neutrinos?

Does an object at rest on Earth accelerate in the timelike base direction?

Will a mass $m$ rotating around a black hole with mass $M$ form a new black hole together with $M$, at a close enough distance?

Can we see the rest-energy of a mass as its kinetic energy in the $ct$-direction?

Question about the derivative of contravariant momentum 4-vector wrt proper time

Does a train that moves at relativistic speed and then decelerates to zero speed, seem to expand to an observer at rest near the tracks? [duplicate]