All Questions
Tagged with general-relativity time-dilation
87
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34
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Is gravitational time dilation different from other forms of time dilation?
Is gravitational time dilation caused by gravity, or is it an effect of the inertial force caused by gravity?
Is gravitational time dilation fundamentally different from time dilation due to ...
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27
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8
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Can a ultracentrifuge be used to test general relativity?
With today's ultracentrifuge technology, they can spin so fast that the sample can be subjected to accelerations of up to 2 millions Gs. That is equivalent to two solar masses. Has someone tried to ...
- 370
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2
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A clock in freefall
Time dilation calculated using Schwarzschild metric for a non rotating spherical body is:
$$t_0=t_f\sqrt{1-\frac{2GM}{rc^2}}$$
For such a non rotating spherical body, what would the time dilation of ...
- 1,011
32
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4
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Why isn't the center of the galaxy "younger" than the outer parts?
I understand that time is relative for all but as I understand it, time flows at a slower rate for objects that are either moving faster or objects that are near larger masses than for those that are ...
- 469
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What is the correct formula for gravitational time dilation for a satellite in a circular orbit?
In the Wikipedia article on Gravitational Time Dilation I see two formulae for the gravitational time dilation. One contains $\sqrt{1 - r_0/r}$ but the other $\sqrt{1 - 1.5 r_0/r}$. What formula ...
2
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3
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How can we explain the position of Mann's planet when travelling on Miller's planet in Interstellar movie?
In the middle of the movie Interstellar, a crew of astronauts land on Miller's planet. For them only one day passed. For the one astronaut left on the station, 23 years passed.
Imagine both look at ...
- 103
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2
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Relativity and Galaxy Rotation Speed
If time travels slower nearer gravity wells, why can't the galaxy rotation speeds being faster on the outer edges than the inner areas be explained by relativity? What necessitates dark matter?
- 463
77
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9
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If the speed of light is constant, why can't it escape a black hole?
When speed is the path traveled in a given time and the path is constant, as it is for $c$, why can't light escape a black hole?
It may take a long time to happen but shouldn't there be some light ...
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4
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Would time speed up near a large body of negative mass relative to observers in micro gravity?
Time tends to slow down near objects with large amounts of positive mass relative to observers in micro gravity. Considering that negative mass is the opposite of normal mass and would time tend to ...
- 2,001
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Time Dilation inside a hollow shell
Assuming I have a hollow shell with total mass $M$ and radius $r$.
On the surface, the gravitational time dilation would be
$$\tau=t \cdot \sqrt{1-\frac{v_{esc}^2}{c^2}}$$
where
$$v_{esc} = \sqrt{\...
- 12.4k
7
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4
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Does gravitational time dilation happen due to height or difference in the strength of the field?
The reason why you have to tune differently the atomic clocks in GPS is because the GPS is higher or because there is less gravity there, or both? In other words in a constant gravitational field ...
- 393
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Does Earth experience any significant, measurable time dilation at perihelion?
Is there any measurable time dilation when Earth reaches perihelion? Can we measure such a phenomena relative to the motion of the outer planets?
- 79
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3
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How is 1 g on a planet different from 1 g in a space ship when we look at aging?
This question has been asked before in the form of the 'Twin paradox' , and there are 42 pages of questions on this site alone when I search for 'twin paradox'.
For example
Does the twin paradox ...
- 1,721
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Are gravitational force and gravitational time dilation proportional?
Particles in gravitational fields are subject to gravitational time dilation. The closer a particle is near a gravitational source, the slower is running its clock. I would like to know more about the ...
- 3,155
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On The Twin Paradox The Symmetry Remains
Please, my question is at the end of this formulated problem.
In the case of the twin paradox, the travel can be made without never accelerating higher than $g$. So the one who remains on the earth ...
