All Questions
Tagged with spacetime time-dilation
251
questions
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Is it theoretically possible to create a 'time bubble', where inside the bubble time will stop or at least slow down radically? [closed]
I am a layman who dabbles online in physics, I thought this would be cool and has probably been done in sci fi already, but was wondering if it were actually possible.
1
vote
2
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274
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Time and speed of light in Relativity
Time running slower near a massive object, but the speed of light does not really change near a massive object, according to Relativity - it just curves. Is not time directly related to the speed of ...
- 103
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1
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108
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0
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2
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117
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How much information do I need for a Lorentz transformation? [closed]
If I use Lorentz transformations,
\begin{align}
x' &= \gamma (x-vt), \\
t' &=\gamma \left(t-\frac{vx}{c^2}\right),
\end{align}
I need $x,v,t$ to calculate $x'$ and $t'$. If I only know, say ...
- 15
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1
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86
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Time dialtion when objects run in the same direction
Just trying to understand the basics.
I saw some videos claiming that when you run towards light the speed of light may appear to be faster than C therefore time corrects it by being slow.
Now the ...
user325851
-3
votes
2
answers
168
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How speed of light is absolute/constant if time (denominator) is relative?
Speed is path / time.
How speed of light in vacuum can be always constant if denominator (time) is relative, its changing?
If speed of light must be constant then path must be changed as well?
- 613
-1
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3
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390
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This question is about time dilation but a bit different
See the image below-
Here I have decribed a scenario related to relativity theory. A spaceship is travelling at "V" velocity relative to a man standing on planet. The Spaceship's frame is ...
1
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0
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37
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Does the clock tick faster when falling? [duplicate]
I just read this answer that explains that the time dilation due to the gravity and the time dilation due to velocity are the same thing.
Does that mean that, if I fall from the top of a skyscraper on ...
- 143
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2
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117
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Confusion interpreting the meaning of the different terms in Lorentz transformation while deriving time dilation
Let us have the familiar Lorentz transformations, given by :
$$\Delta t_{s'}=\gamma\left(\Delta t_s-\frac{v\Delta x_s}{c^2}\right)$$
$$\Delta t_{s}=\gamma\left(\Delta t_{s'}+\frac{v\Delta x_{s'}}{c^2}\...
- 1,791
0
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3
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409
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Why would spacetime curvature cause gravity given that the value of gravitational time dilation is so small?
In this question, mpv provides the clearest explanation of the operation of gravity in his answer:
The apple moving first only in the time direction (i.e. at rest in space) starts accelerating in ...
- 300
17
votes
4
answers
13k
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Why does everyone say that the faster you move through space, the slower you move through time, when that's not the case?
Suppose, I'm on earth and my brother is moving away from earth at a constant speed, $v=0.8c$. Now, if 5 seconds $(t_0)$ pass for me, the amount of time that will pass for my brother according to me ...
- 1,018
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A star is just born and starts travelling towards us at 99 percent speed of light. So how would an immortal observer observe the light from it?
An immortal observer is observing a new born star from billions of lightyears away travelling towards it at near the speed of light (99%).
The star is a short living one and dies soon before reaching ...
13
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9
answers
3k
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How does gravitational time dilation affect matter?
Einstein successfully melded together space and time into one entity called spacetime in his General relativity theory and gave us further insight into how matter affects spacetime.
John Wheeler said “...
- 719
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2
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98
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How can time slow down and speed up for a particle simaltaneously?
Suppose there's a kangaroo baby in its mother's pouch and there's a light bulb 300,000 km from them. If someone turns on the bulb, both kangaroos will agree that the light bulb takes 1 s to turn on ...
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How does gravity affect time dilation? [duplicate]
I understand that the faster you move through space the slower you move through time, but how does gravity play a role in that?
