All Questions
Tagged with spacetime time-dilation
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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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How do you show that the temporal part of an object's 4-velocity is decreasing as that object approaches the speed of light? [closed]
As a moving object approaches the speed of light then the temporal component of its 4-velocity should be decreasing. How do you derive and show that this is what is occurring?
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How could time move "slower" for some observer-A moving "faster" than another observer-B when velocity is relative? [closed]
I've never understood how time dilation due to speed works. Take the most well-known example of an astronaut orbiting around the earth at insane speed for a while and then returning to earth having ...
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Why is the book using the equation of $\Delta t$? [closed]
I have a question on a worked out example from a text book. The example is as follows.
A proposed plane would carry intercontinental travelers at speeds many times those of today’s fastest airliners. ...
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Why does spatial distance measurement work differently than proper time measurement in general relativity?
In §84 of Landau and Lifshitz's Classical Theory of Fields, L&L talk about measuring distances and time intervals in general relativity.
They begin by finding the dependence of proper time $\tau$ ...
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Can Shapiro Time Delay cause light in a vacuum to go faster than c as viewed from a remote reference frame?
I know within any reference frame the speed of light is fixed. But it has been shown that light does appear to slow down when passing massive objects as viewed from a remote reference frame per https:/...
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Where in the universe does time pass fastest relative to time on earth?
It is my understanding that time essentially moves slower in higher gravitational fields relative to time on earth. Conversely, in lower gravitational fields, time passes faster relative to earth. Is ...
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Time Dilation Explanation [closed]
This might be a dumb question but I'm still going to ask it.
So basically I've been trying to learn Special Relativity through this lecture by Brian Greene, and the way he justifies time dilation is ...
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How can you calculate how long life will last with a regular run in terms of special relativity?
Imagine, John run everyday 10 km with speed 12 km/h towards the east along the equator. If he had not run, he would have died at 70 from the point of view of a motionless observer. How long will John ...
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Minkowski Diagrams and Synchronized Clocks [duplicate]
While using Minkowski diagrams for studying spacetime and time dilation, I came across a problem that seems like a paradox to me, but may actually just be from a lvl of understanding.
Imagining two ...
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In the twin paradox or twins paradox what do the clocks of the twin and the distant star he visits show when he's at the star?
In the twins paradox of relativity one twin stays on earth while the other travels to a star ten light years away, and then immediately flies back. Because his rocket travels at just under the speed ...
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Is time dilation just a perceived difference in the passage of time or a real physical difference? [duplicate]
I am no physics expert, but I read that if someone, the same age as me, travels at near the speed of light time will go a lot slower for them. So that means that I would age quicker than that person. ...
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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 ...
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Time transformation term in Lorentz transformation
In the lorentz tranformation, I have got the following equation for time:
$$t' = \dfrac{t - \dfrac{ux}{c^2}}{\sqrt{1-\dfrac{u^2}{c}}}$$
The $S'$ system is moving relative to $S$ system with speed $u$, ...
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Using time dilation to find universal frame of reference
Before I ask this question, I just want to clarify that I am by no means an expert and that this question most likely came about due to my ignorance on the subject. If this is the case, please let me ...
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