All Questions
Tagged with general-relativity time-dilation
427
questions
-3
votes
2
answers
112
views
What made Einstein to think time also dilates, along with space, with increasing gravity?
Michelson–Morley experiment showed that speed of the light remains same regardless of speed of observer. Based on it Albert Einstein came up with the proposal of time dilation for object in speed (...
- 27
2
votes
2
answers
135
views
Is there a location in the universe with the minimum rate of time dilation?
According to general relativity, time dilation occurs due to strong gravitational fields and high relative velocities, causing time to pass more slowly compared to observers in weaker gravitational ...
1
vote
0
answers
31
views
Gravitational Time Dilation: How to find the time difference between orbits at different radii? [closed]
I want to calculate the difference in time measured by a clock at on earths surface (r=6000km), and a geostationary satellite (r=26000km). My approach is as follows:
For simplicity, we consider curves ...
- 11
4
votes
2
answers
627
views
GR contribution to time dilation when both clocks are falling freely
When reading simplified explanations of time dilation experienced by satellites, such as those used for the GPS and other satellite navigation systems, the time dilation is often presented as having ...
3
votes
3
answers
329
views
Comparison of clocks running at different heights in a gravitational field
I hope this question has not yet been asked. If so then please link me to the answer.
If I build an apparatus which, on flicking a switch, sends a light beam, a distance to a mirror, and reflects it ...
16
votes
4
answers
4k
views
How long is a second on the moon?
The Office of Science and Technology Policy, part of the government of the United States of America, issued this statement outlining the need for a Lunar Standard Time (LST) standard. They state:
For ...
- 4,030
1
vote
1
answer
96
views
Variation on Twins Paradox - Simulating Gravity
There are many questions exploring variations upon the Twin Paradox, but none I have seen seem to resolve this thought experiment.
It is often said that the 1g force we feel on earth due to the ...
- 11
0
votes
1
answer
71
views
On the equivalence principle
In its simplest version, it states that
the effects of a uniform gravitational field are indistinguishable from those of a uniform linear acceleration of the frame of reference
The thing is, you can ...
- 1,644
0
votes
0
answers
46
views
Is there a newtonian limit approximation for gravitational time dilation?
The gravitational redshift equation (for a spherically symmetric gravitational field) is:
Within the Newtonian limit, there is an approximation:
The gravitational time dilation equation (for a ...
- 319
0
votes
3
answers
124
views
Relativity and variable time - there is an alternate formulation where time is always linear. Has it been studied?
Lorentz, Einstein et. al. assume time is the variable which changes in a gravity well or as speed approaches $c$. That's the commonly accepted model.
For nearly 50 years I've wondered if anyone else ...
- 19
0
votes
0
answers
59
views
Time dilatation of a free falling observer [duplicate]
I have two questions about time dilation near a black hole.
(I question) The relation $d\tau^2 = (1-\frac{r_s}{r}) dt^2$ between the proper time $d\tau$ of an observer near a B.H. and the time dt ...
- 21
1
vote
2
answers
130
views
Does infinite time dilation increase a photons energy to collapse to a black hole, and does it do the same for matter?
As I understand the mass of an object doesn't increase in a gravitational field according to general relativity. It just follows a geodesic, its worldline.
Now imagine a small marble falling straight ...
- 95
3
votes
4
answers
835
views
Gravitational Time Dilation and the Apparent Speed of Light
It has been proven that time far away from Earth is faster than time on the surface of Earth, due to gravitational time dilation. (GPS satellites take gravitational time dilation to account.)
Would ...
- 141
0
votes
1
answer
60
views
Effect of gravitational time dilation on a classic weighted pendulum clock versus a hybrid pendulum clock with a battery
A classical pendulum clock is powered by gravitational potential energy by weights. While a hybrid pendulum clock is somehow propelled by electric current. Both have the same pendulum swing as the ...
- 95
0
votes
2
answers
53
views
Gravitational effects on a celestial body and the difference between a pendulum and a regular clock
Imagine a planet with the same properties as Earth, this time moving in an elliptical orbit around a heavy star of a large number of solar masses. Also imagine that the surface of this planet is as ...
- 95