All Questions
41
questions
5
votes
3
answers
239
views
How did Einstein figure out mass (and hence energy) bends spacetime?
I can understand that once I fix the velocity of light at $c$, there is a relative variation in space-time based on special relativity (inertial frame of reference). It's not clear to me how Einstein ...
- 131
0
votes
5
answers
212
views
Vacuum solutions in presence of mass?
Here is the page I will be referencing: Vacuum solution (general relativity) - Wikipedia
My point is: if $T_{\mu\nu}=0$ implies that there is no mass, how can Schwarzschild vacuum be a solution, if ...
- 145
-2
votes
2
answers
71
views
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 ...
2
votes
1
answer
320
views
Why cant a repulsive event horizon of negative mass be theoretically constructed?
An event horizon appears in the Schwarzschild metric when considering a positive point mass in General Relativity.
But for a negative point mass in the negative mass Schwarzschild metric, which ...
- 476
0
votes
3
answers
107
views
How and why bodies with great masses alter time?
I am dreadfully sorry for any mistake in jargon.
Theory of relativity, or so the interpretations of which I was merry to read; states that great masses get to alter, and this is where I get confused, '...
- 11
2
votes
0
answers
275
views
Showing the ADM-Mass of Schwarzschild-Spacetime
Can someone show that the ADM-Mass of Schwarzschild is identical with the Mass-Parameter?
- 159
0
votes
3
answers
168
views
Relation between mass and spacetime
I am trying to understand whether spacetime possesses an intrinsic "elasticity" that is acting as a sort of counter-force to mass trying to bend it.
0
votes
1
answer
39
views
Does local gravity change when approaching the speed of light? (Relativistic mass) [duplicate]
Let's say we'd transform earth into a giant space ship and had some planetary drive that can accelerate it without burning any kind of fuel (so the amount of matter on earth stays the same - we'd ...
6
votes
2
answers
532
views
Does kinetic energy of an object curve spacetime? [duplicate]
Based on general relativity mass and energy distribution curves spacetime. Thus, if an object with 1kg rest mass moves with constant speed and has a speed very close to speed of light, then it has an ...
- 947
5
votes
2
answers
2k
views
Is it the mass that bends spacetime, or is it the gravity?
I had understood that mass bends spacetime and that curvature generates gravity, but I have recently read that what bends spacetime is gravity.
Which comes first? Does the mass generate gravity, and ...
- 173
0
votes
1
answer
271
views
Is mass the source of space-time?
The Einstein field equations (EFE) characterize how mass curves spacetime.
$$ R_{\mu\nu}-\frac{1}{2}g_{\mu\nu}R=\kappa T_{\mu\nu} $$
I try to understand the curvature of spacetime.
In the EFE, there ...
- 255
4
votes
4
answers
4k
views
How can time be curved?
Time isn't a physical object, but according to Einstein's theory of gravity, mass bends spacetime towards things with mass and makes them fall. How does a physical object affect something intangible?
0
votes
1
answer
108
views
Black hole and white hole symmetry
NB: This question comes from an idea I had while watching this video about the video game portal and its sequel (link: https://www.youtube.com/watch?v=aj8NDOA0Sgw at 15:30 the idea of a black hole was ...
- 9
4
votes
4
answers
1k
views
Mass as space curvature [duplicate]
General relativity states (in simplified vocabulary) that mass curves the space-time, being gravity one of the observable effects of this curvature.
Is there any theory or works starting on the ...
- 1,128
0
votes
1
answer
86
views
How is the fabric of space-time curved? It bends due to energy or mass, but what causes bending? [duplicate]
When we experiment with General Relativity on Earth, a tissue bends according to the experiment due to the placement of a mass, but of course there is a gravitational pull that causes bending. If we ...
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