All Questions
Tagged with gravity time-dilation
123
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How to properly combine kinetic and gravitational time dilation effect?
I developed a time dilation calculator that includes both kinetic (Lorentz Factor) and gravitational (Schwarzschild Metric Formula) factors to assess the time difference between Earth and satellites. ...
8
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5
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1k
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Do you always experience the gravitational influence of other mass as you see them in your frame?
You see a galaxy far away. That galaxy is attracting you with a certain amount of gravity. I'm wondering if the gravity influence of the galaxy on you, as measured by you, always ends up being what ...
- 171
3
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2
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86
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Tug of war between observers in frames with different rate of time
You have a very dense hollow sphere of matter. Observer A is inside the sphere inside a rocket. Observer B is in an identical rocket outside the sphere where the ring's gravity is negligible. They are ...
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40
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Topological illustration of spacetime dilation: which function should I use for isometric lines spacing?
Scientific popularization, when it comes to illustrating spacetime dilation around massive objects, often relies on the description of a two-dimensional square-grid, which can be regarded as a cross-...
3
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1
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134
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Time dilation and angular velocity
Is angular velocity (the horizontal rotation of a massive disc falling through the air) sensitive to time dilation or invariant to it? Will its angular velocity (speed of rotation) increase, decrease ...
- 95
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31
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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 ...
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4
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2
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628
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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 ...
0
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1
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60
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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 ...
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2
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50
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Observing an event horizon while approaching one
A thought crossed my mind that I realized was hard to conceptualize so I decided to simplify the question by putting it in terms of event horizons.
If I am an observer approaching black hole "A&...
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4
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2
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291
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Photoelectric effect under the influence of gravitational time dilation
If the energy of a photon increases under the influence of time dilation in a gravitational field, does this have an effect on the photoelectric effect? Does this mean that the photoelectric effect in ...
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Is there a formula for gravitational time dilation at the cosmological scale?
There is a standard formula for gravitational time dilation used in eg the operation of the global positioning system. It is based on the integration of g(h) where g is a function relating ...
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29
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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
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1
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45
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When calculating the amount of missing mass in a galaxy due to dark matter, do cosmologists take into account local effects of gravity on time? [duplicate]
If I understand correctly, massive objects cause time dilation, and so time seems to pass more slowly for observers closer to a massive object than those who are farther away. Do cosmologists take the ...
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1
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1
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92
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GENERAL RELATIVITY: gravitational time dilation outside 2 bodies [closed]
I know that gravitational time dilation near a single body is:
$$T_2=T_1\sqrt{1-\frac{2GM}{rc^2}} $$
Can you give gravitational time dilation formula when in proximity to multiple bodies?
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2
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2
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833
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Why does time flow more slowly on the ground than on a mountain? [duplicate]
I'm reading the book The Order of Time by 'Carlo Rovelli', which says that time flows more slowly on the ground than on a mountain. It also says that the presence of matter changes how time flows, and ...
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Would time dilation increase the distance between objects? [closed]
Two objects are moving towards a gravity well. They are at $x$ distance from each other and moving at a fixed speed. The gravity well is massive enough for the objects to experience significant time ...
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80
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How to sync up different timelines and real events in general relativity? [closed]
Imagine this scenario:
Mike lives on a massive planet, so massive he experiences time going slowly.
Le petit prince lives on a small planet ( not much time dilation )
After millions of years (making ...
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2
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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 ...
8
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7
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4k
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Why don't two accelerated clocks behave like two clocks in a gravitational field?
If we immerse two clocks in a gravitational field at different altitudes (with the approximation that both heights share the same g for equivalence to be true), the falling and Schwarzschild observers ...
- 97
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1
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112
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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 ...
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2
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286
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How to take the integral of the gravitational time dilation formula
The formula for gravitational time dilation is $t' = t\sqrt{1-\frac{2GM}{rc^2}} $. That gives us a value of $t'$ at some distance $r$. But is it possible to find the integral value over two different ...
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32
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How do we know that gravity emission is not time dilated like luminosity? $g'=γg$
It seems like gravity emission would be expected to decrease with time dilation. I've thought this from my first reading of Special and General Relativity, and I never heard a satisfying explanation ...
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4
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192
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Is there time dilation at the gravitational cancellation point between two masses?
I read that at the point of gravitational cancellation between two masses there was still time dilation, because this dilation depends on the gravitational potential and not on the gravitational force ...
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3
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How is the time dilation changed on a rotation fluid ellipsoid?
Are the polar and equatorial radiuses of a rotation fluid ellipsoid approximately depended of the rotation velocity by this equation
$$\frac{{GM}}{{{r_{{\text{pole}}}}}} - \frac{{GM}}{{{r_{{\text{...
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1
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78
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How does gravity affect "Timeless" particles like photons?
Just finished a class a while ago and in it was discussed the nature of gravity being due to mass' effect on time etc. etc.
My question is: how then does gravity effect something like a photon, which ...
1
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0
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48
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Correct form of gravitational time dilation comparison between frames?
So, assuming the following is correct, for proper time $\tau$ and reference time $t$ with $\phi$ potential per unit mass
$$dt \approx \frac{d\tau}{\sqrt{1+\frac{2\phi}{c^2}}}$$
If you're trying to ...
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161
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How is gravitational time dilation different from the time dilation from Special Reativity? [duplicate]
In Special Relativity, acceleration i.e. a changing velocity 4-vector results in time dilation, that is asymmetric aging of observers.
In General Relativity, the 4-vector does not change along a ...
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3
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1k
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Is time dilation due to relative velocity equivalent in principle to time dilation due to relative gravitational strength?
Is time dilation due to relative velocity and relative gravitational strength equivalent? That is, similar to Einstein's thought experiment where an observer in an enclosed capsule with no windows ...
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165
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Expansion for gravitational time dilation
In the section on gravitational time dilation in Prof. David Tong's lecture notes on general relativity, he performs the following expansion:
$$t\sqrt{1-\frac{2GM}{r_{A}c^{2}}+\frac{2GM{\Delta}r}{r^{2}...
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195
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Clocks in gravitational field
"In a gravitational field clocks slow down" - this is an effect of gravitational redshift.
Are the following statements correct?
If I take a "clock" from the surface of the Earth ...
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