All Questions
Tagged with spacetime time-dilation
251
questions
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Time dilation for different observer in black hole metric
If I have a 2d Schwarzschild metric
$$
dS^2 = -(1-\frac{r_s}{r})dt^2 + \frac{dr^2}{1-\frac{r_s}{r}}
$$
I want to find the relation between the time of an asymptotic observer $t$ and the proper time of ...
- 57
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6
answers
173
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If time runs slow for moving train, how can it cover same distance in less time than someone on the ground unless the track decreases in its view?
According to special relativity,
Δt=γ*Δt' ... (1)
Where,
Δt is the time the train takes to completely pass by me according to my watch,
Δt' is the time I should see has passed for someone on the train....
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1
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99
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The apparent dilatation of time in General Relativity
Maybe this a dumb question, but, is the gravitational dilatation of time caused because a particle travelling through a geodesic in a curved space-time must cover a larger distance than the one ...
- 1,525
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76
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Is it more accurate to say space in a weaker gravitational field is contracted, or that time is faster?
Little thought experiment. An observer places a mirror and a clock 1 lightyear away from a black hole. He then goes in the black hole's gravitational field at a point where he sees the clock tick at 2 ...
- 171
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3
answers
104
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Why doesn't Galilean relativity lead to a contradiction in SR?
Two identical spaceships commanded by Alice and Bob are at rest next to each other in outer space. The clocks of the spaceships are synchronised; and when they are close by Alice can see Bob's clock ...
- 99
-2
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2
answers
60
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Time dilation query [closed]
In the light clocks, time ticks via the motion of light and since speed of light is constant therefore when the clock is in motion ,the photon has to cover a greater distance by the perspective of an ...
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1
answer
57
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What is the reason of different clock's measurements in different frames? [closed]
I tried to understand what is the reason of different clock's measurements in different frames.
For this I looked at easy example with distance S traveled by man with moving clock (velocity V1=2m/s) ...
- 149
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0
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Is there really no way to know if you are accelerating or you are in gravitational field? [duplicate]
So any gravitational field will have a gradient, no? But an accelerating object does not experience any gradient of force. So you should be able to tell if you are in gravity or accelerating by ...
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1
answer
92
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Can time in space be years faster than on Earth? [closed]
Is it possible that in some distant solar system from another galaxy, time will be dramatically different from our Earth time, with years passing far faster than on Earth time?
-1
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1
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118
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To what extent does Time Dilation occur?
Time Dilation is a fundamental concept in the theory of relativity, encompassing both special and general relativity. It describes the phenomenon where time appears to pass differently for observers ...
- 113
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0
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59
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Relativistic electric field [duplicate]
Assuming a charged particle moves at speeds near the speed of the light. Will the electric field generated by that particle get affected by length contraction and time dilation?
In other words, will ...
- 291
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3
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Why can clocks not be compared unless they are meeting?
In the answer here to a special relativity question about clock synchronization: https://physics.stackexchange.com/a/485517/141472 it says (bolding mine):
As long as the two space ships are not ...
- 531
0
votes
2
answers
81
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Time of collision of two relativistic speed particles
Suppose I have two particles, one moving at $0.9c$ to the right, starting at $(-0.9c,0,0)$ in the lab frame at $t=0$ and the second one moving at $0.9c$ to the left, starting at $(0.9c,0,0)$. In the ...
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-3
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1
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99
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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 ...
- 141
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1
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175
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The Achilles Twins Paradox: Proof of a Preferred Frame? [closed]
The Achilles Twins Paradox: Proof of a Preferred Frame?
Abstract: Both Achilles and Bob spend the exact same amount of time accelerating and decelerating at the same rates. Both Achilles and Bob spend ...
