All Questions
13
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
12
votes
2
answers
2k
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How do we know the assumptions of the Schwarzschild solution are valid?
The Wikipedia article on the derivation of the Schwarzschild solution (https://en.wikipedia.org/wiki/Derivation_of_the_Schwarzschild_solution) lists 4 assumptions. The second of which is:
A static ...
- 1,011
0
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2
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157
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Is time dilated for objects that make a close orbit around (massive) bodies?
I understand that, according to general relativity, matter warps space-time in such a way that the 3-dimensional projection [in space] of the geodesic of an object subject to no forces looks like ...
- 1
2
votes
2
answers
262
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How do I deal with the radius-coordinate of the schwarzschild-metric in this numerical problem?
It is well known that if a black hole fulfills certain conditions, it's tidal forces will rip incoming objects apart even before they cross the event horizon. So at some point, the curvature of space ...
- 101
1
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1
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259
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What is the equation for gravitational time dilation? [closed]
I have been studying relativity for a while now, but I am still unsure what the equation is to determine a gravitational time dilation. I am more than aware of the speed time dilation equation, but I ...
- 11
0
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1
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68
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What determines intensity + range of a gravity field?
Related questions..
How does the Sun's gravity extend out millions of miles to influence the far reaches of our solar system?
Reference: movie - "Interstellar", 2014 Nolan) / How does a ship ...
- 55
0
votes
1
answer
59
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Visualization of object falling into black hole from the perspective of a distant observer
There exist a few relativistic renderings, even videos of this kind of event from the perspective of the infalling object, yet I have never seen the same event from the perspective of a distant ...
- 347
1
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0
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28
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Can one observe a blackhole grow from outside its event horizon? [duplicate]
For an observer outside Black hole's event horizon nothing ever falls into the black hole .
So if the observer waits for an eternity outside a super massive blackhole feeding on gas , will the ...
- 838
0
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1
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243
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For a distant observer can a black hole form and grow in finite time? [duplicate]
Consider an observer at a significant distance away from a collapsing star.
As such when a singularity is born at the core of the star the observer would never see it grow anymore than the ...
- 838
4
votes
0
answers
82
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Energy of background radiation while falling into a black hole
As you fall into a black hole, the old story is you would be spaghettified - and this question is not about that.
However passing of time would be warped, so you would see the future of the universe ...
- 482
0
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1
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667
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Time Dilation inside a massive body [closed]
First, I know this is related to the previous question Time inside a Black hole, but my focus here is more hypothetical.
The equation of time dilation stands for:
$$t_{0}=t_{f}{\sqrt {1-{\frac {2GM}{...
2
votes
1
answer
275
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Can you shine a laser on an object that has fallen into a black hole? [duplicate]
I've been having a small back and forth on another website about the nature of objects that fall into black holes.
I know that they never reach the event horizon from the perspective of a distant ...
- 31
4
votes
2
answers
337
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What are the photon/electron consequences of matter in a gravitational time dilation?
So I saw the movie Interstellar, and it got me thinking. I won't even mention all the plot holes, but I wanted to ask about a planet orbiting a black hole. I always thought you had to travel near the ...
- 213