All Questions
88
questions
1
vote
3
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103
views
Do clocks tick faster when gravitational forces are weaker?
A professor last year taught us that "gravity slows clocks," when teaching about the relationship between gravity and time. This led me to think about places, such as intergalactic space, ...
2
votes
0
answers
69
views
Gravitational time dilation near the Earth [closed]
I recently read the statement that near the Earth, in the Newtonian weak gravitational field, gravity is 99.9999% mainly due to "curvature of time" (ie gravitational time dilation), and only ...
- 928
2
votes
1
answer
62
views
Need help to clarify understanding example of time nature from Hawking's book "Briefer History of Time"
I'm reading Hawking's book "Briefer History of Time" both in Ukrainian and Russian languages and found a possible translation mistake in this paragraph (last page of "Chapter 6. CURVED ...
0
votes
0
answers
36
views
Measurement of the velocity of a celestial body by means of (relativistic and classical) gravitational effects on clocks
Imagine a planet with the same properties as Earth, this time moving in an elliptical orbit around a black hole of a large number of solar masses. Also imagine that the surface of this planet is as ...
- 95
0
votes
0
answers
29
views
Calculate mass from time dilation
Hi not a physicist in any way so was wondering if I know the age (time passed) and mass of an one object and the age (time passed) of another object, can I calculate its mass?
So Object 1 is Earth:
...
- 101
0
votes
0
answers
40
views
Local Gravitational Time Dilation Effects on Entangled Particles
If Alice is located just beyond the event horizon of a black hole, and Bob is at some other point in space with de minimis gravitiational effect, what, if any, effect would it have on the "spooky ...
-2
votes
2
answers
75
views
Is it true that time dilation in a universe with no gravity could not be calculated without knowing how much mass is present in the universe?
Looking for a quick clarification on something. I am a layman and I have been trying to find out how much time dilation would exist if there was no gravity anywhere, and ignoring what seem to be ...
2
votes
0
answers
79
views
What is Dirac talking about here? [duplicate]
https://www.youtube.com/watch?v=xJzrU38pGWc&ab_channel=mehranshargh
"I might say that my recent work has been very much concerned with Einstein's general relativity and I believe that the ...
- 195
1
vote
0
answers
33
views
How much time does the gravity field generated by a black hole singularity need to travel before exerting gravity forces on other celestial bodies?
It is known to all that the propagation of gravitational field is not instant.
So for black holes, the gravitational field generated by the singularity of the black holes needs time to travel before ...
0
votes
1
answer
112
views
Understanding consequences of spacetime relativity
If I understood right, time flows slower where there is more gravitational force (or to be more precise, as it was pointed out to me, where gravitational potential is lower), compared to where there ...
- 141
0
votes
0
answers
43
views
Using position of a free particle to measure time
Hartle, gravity
An observer in an inertial frame can discover a parameter t with
respect to which the positions of all free particles are changing at constant rates.
This is time
Then goes on to say
...
- 1,270
2
votes
0
answers
52
views
EM field in a strong gravitational field
Imagine simple solenoid 10cm in length with given magnetic field in a gravitational field with a large gradient, for example the clock near one pole of the solenoid is running 1 second faster, meaning ...
- 21
-7
votes
1
answer
76
views
The speed of time [closed]
If the speed of light is 14,545.075 x the speed of sound, could the speed of time (and/or gravity) be 'something' like that times the speed of light, say 2,705,384,023.877 m.p.s? (Sonic boom > ...
5
votes
3
answers
1k
views
Is time dilation due to relative velocity equivalent in principle to time dilation due to relative gravitational strength?
Is time dilation due to relative velocity and relative gravitational strength equivalent? That is, similar to Einstein's thought experiment where an observer in an enclosed capsule with no windows ...
- 307
0
votes
0
answers
109
views
Free Fall time in General Relativity
Suppose you are working with the Schwarzschild metric in GR.
$$
-c^2 \mathrm d \tau ^2 = -c^2 \left (1 - \frac{2 G M}{c^2 r} \right) \mathrm d t^2 + \left (1 - \frac{2 G M}{c^2 r} \right)^{-1} \...
- 1,525