All Questions
17
questions
-3
votes
3
answers
76
views
Does Matter Cause Curvature or Vice-Versa [closed]
From the way explanations about gravity-acceleration-curvature equivalence are usually phrased here or elsewhere, it would appear many or most think that matter causes space-time curvature.
I cannot ...
- 115
0
votes
0
answers
50
views
How the equivalence principle leads to the idea of curved spacetime? [duplicate]
In wikipedia https://en.wikipedia.org/wiki/Equivalence_principle, there are three forms of equivalence principle ( equivalence of gravitational and inertial mass ) :
Weak version (Galilean) :
The ...
- 317
-1
votes
1
answer
106
views
When doing general relativity in practice, how do we choose the appropriate manifold describing the scenario?
The theory only deals with the local curvatures, not the global topology. Hence any manifold with an allowed metric is allowed. These can be infinitely many, especially for negative curvature space-...
- 7,980
1
vote
3
answers
108
views
Where is the normal force that pushes us up comes from if gravity is not a force according to general relativity?
https://youtu.be/XRr1kaXKBsU?t=530
I was watching this video and at this point he said that since gravity is not a force as per GR, we are left with only these normal forces pushing you up that ...
- 21
1
vote
2
answers
944
views
Does an accelerated rocket curve spacetime?
I am not a physicist, I am an observer, a student of the theory of relativity. I have a doubt about the principle of equivalence. I know that there are two different acceleration phenomena, one is ...
- 29
0
votes
3
answers
164
views
Would I be able to tell if I was inside a piece of distorted space? Are objects distinct from spacetime?
If one could hypothetically stretch / squash / in some way distort a piece of space, an outside observer could tell by looking at the distorted object/space that it had changed because the difference ...
- 149
1
vote
1
answer
138
views
How equivalence principle explains curvature of space?
We know that the equivalence principle explains the slowing down of time, since, with respect to an inertial observer the time difference between sending two successive light pulses at the head of the ...
- 1,161
4
votes
3
answers
189
views
Motivation for curved spacetime on General Relativity
I'm trying to motivate the theory of general relativity. Concretely, using which arguments is it deduced that spacetime must have the structure of a curved Riemannian manifold?
From the strong ...
- 95
0
votes
0
answers
32
views
Rindler metric and equivalance principle [duplicate]
I'm trying to understand the connection between The Equivalence principle and the Rindler space. According to Einstein the inhabitants of the elevator should feel the acceleration. However, for an ...
- 146
6
votes
2
answers
209
views
Einstein's initial clue that spacetime is curved [closed]
I did General Relatively years ago at Uni. I have revised a lot of the maths demo Dirac''s book. It is incredible the leap in thought to noting from the Bianchi identities that the curvature term's on ...
- 1,087
5
votes
5
answers
763
views
Equivalence principle doubt
There is something about Einstein Equivalence Principle that I don't quite get. This is my reasoning:
Equivalence principle $\rightarrow$ locally, acceleration is equivalent to a gravitational field
...
- 719
0
votes
1
answer
309
views
Is the gravitational field an illusion, a by-product of geometry? [duplicate]
The principle of general covariance from the Equivalence Principle (EEP) tells us that there is no way in principle to locally distinguish between an inertial acceleration and the effects of a ...
- 1
2
votes
1
answer
589
views
Riemann tensor and metric tensor second derivatives
I know that in general relativity, unlike in electromagnetism, the field tensor must be dependent on metric tensor second derivatives, since I can always find a reference system in which its first ...
- 639
1
vote
2
answers
166
views
Falling with same acceleration and meaning of gravity
My question is what does falling with same acceleration has to do with what Einstein concluded concerning the gravity in terms of the curvature?
- 1,529
5
votes
1
answer
1k
views
Gravity is curved geometry: A fact of nature or model-dependent interpretation?
We are regularly taught in high-schools and universities that, according to General Relativity (GR), gravity is nothing but a manifestation of space-time curvature (which, in its turn, is caused by ...
- 547