All Questions
Tagged with spacetime general-relativity
1,867
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Carter-Robinson Theorem
There are uniqueness theorems that classify Black holes according to its mass, angular momentum and charge. One of the theorem is Carter-Robinson theorem which has many assumptions and then it says ...
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Are there any ways to conceptualize the relationship between gravity and space-time other than curvatures?
This might sound like a random question, but it came to me while I was trying to conceptualize the size of the universe and started thinking of entire galaxies resembling grands of sand floating ...
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Intuition for the interior Killing vector fields in Schwarzschild?
The Schwarzschild metric represents a stationary (and static), spherically-symmetric, spacetime. These characteristics are manifested by the four Killing vector fields: one for time translation and ...
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Still having trouble understanding gravitational lensing [duplicate]
The normal diagram used to explain gravitational lensing shows a two-dimensional plane that is deflected by a heavy weight. This is a two dimensional description that requires an extra dimension to ...
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Turbulence in Spacetime [duplicate]
Is it possible for the phenomenon of turbulence – eddys and vortices on many scales – to occur in spacetime in the context of General Relativity? For example near a Kerr black hole.
If not, what is ...
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Why does trajectory in the space curved by gravity, depend on the speed?
I am sorry about the probably naiive nature of this question (I am a software eng, not a physics student):
I (think I) understand the popular curved "trampoline" model of 2-dimensional space,...
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In Relativity theory, is chronological relation an order relation?
Let $(M,g)$ be a (Lorentz) spacetime, i.e a connected smooth manifold $M$ with a metric tensor field $g$ and a time orientation called future direction which is defined by a smooth timelike vector ...
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What is Dirac's reasoning when saying parallel displacement creates vector field with vanishing covariant derivative?
Section 12 of Dirac's book "General Theory of Relativity" is called "The condition for flat space", and he is proving that a space is flat if and only if the curvature tensor $R_{\...
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JT gravity metric - solution to the dilaton equations of motion
I am reading Closed universes in two dimensional gravity by Usatyuk1, Wang and Zhao. The question is not too technical, it is about the solutions to the equations of motion that result from the ...
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Gravitational field of the star changes the paths of light rays, how is this observed during eclipse?
The gravitational field of the star changes the paths of light rays in space-time from what they would have been had the star not been present. I understand that the light cones are bend slightly ...
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How does Einstein's spacetime curvature theory for gravity actually makes sense? [duplicate]
I have a lot of confusion understanding the concept that a mass creates a curvature in the space time and other small masses gets attracted towards big masses since they starts falling inside that ...
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Examples of spacetimes that are asymptotically flat at future timelike infinity
There are interesting non-trivial examples of spacetimes which are asymptotically flat at null and spacelike infinities. For example, the Kerr family of black holes satisfies these conditions. However,...
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Limit of gravity
Is there any limit to the bending of spacetime due to gravity?
I have been reading about wormholes and how they bend spacetime and connect two systems. But if there is no limit to gravity, we can ...
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3
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What is spacetime like according to general relativity? [duplicate]
It is often said that matter curves space (or rather spacetime) in general relativity.
But why should matter curve space one way and not the other way? So it seems like a metaphor, I guess.
I read ...
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Shouldn't there be a gravitational field without any mass in our 3d space? [closed]
Imagine there is a Neutron star Displaced a small distance from our accessible 3d slice in the direction transverse to that 3d slice. It will bend the space around it. It will also bend the space of ...
