All Questions
9
questions
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votes
1
answer
120
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Stress-energy tensor in different reference frames and spacetime curvature
The components of the stress-energy tensor are different in different reference frames. Also there is no universal time, so values of energy will be different in different reference frames.
Via the ...
- 65
0
votes
1
answer
110
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Is space in a rotating frame flat?
Apparently in papers like "Space geometry of rotating platforms: an operational approach" https://arxiv.org/abs/gr-qc/0207104 (page 21) and https://www.amherst.edu/.../view/10267/original/reden05.pdf (...
- 1,082
3
votes
3
answers
603
views
Is spacetime-curvature relative?
Velocity is relative, which means kinetic energy is. Since, according to general relativity, energy bends spacetime around it, wouldn't this mean observers moving in different inertial frames measure ...
- 510
2
votes
2
answers
136
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Attraction of matter in curved spacetime
Is there still going be a force between them (converging space which makes the two bodies meet together at a point)if both of them are absolute rest with respect any frame of reference.
user207917
2
votes
3
answers
727
views
What makes the Earth accelerate in a free-falling object's frame of reference?
If I'm an object in free fall near earth, then I'm an inertial frame of reference and I see the earth accelerating towards me with no force acting upon it. What causes that acceleration? The spacetime ...
2
votes
0
answers
62
views
About General Relativity and Reference Frames
So, I came up with this question which is intriguing me since a bit. Maybe it's stupid, but it's always better to ask.
The question is about inertial reference frames (I'll name them IRF)
We know ...
- 3,705
4
votes
3
answers
237
views
Space bends relative to what? [duplicate]
We all are aware of gravitational waves, as it bends space and time, black hole squeeze space, but the squeezing, bending, expanding happens reference to what? Since the observable universe is the ...
- 51
0
votes
0
answers
173
views
Confusion in Special Relativity: Rotating frame of reference
Suppose we are observing a rotating frame from an inertial frame, free from gravity, and try to measure the circumference of a circle drawn in the rotating frame. Since our measuring rod would be ...
- 112
5
votes
3
answers
705
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A thought experiment on vision and curved spacetime
What follows is a long self-made example to deal with my conceptual issues of visualizing curved spacetime.
Imagine an observer floating somewhere in space.
He feels no strain on his body, ...
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