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Results tagged with general-relativity
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user 2655
A theory that describes how matter interacts dynamically with the geometry of space and time. It was first published by Einstein in 1915 and is currently used to study the structure and evolution of the universe, as well as having practical applications like GPS.
12
votes
3
answers
2k
views
Is there an energy density limit in GR?
I am speaking about GR with classical fields and energy. One question, spread over three increasingly strict situations:
Is there an energy density limit in GR? (literally, can the energy density hav …
- 2,155
12
votes
2
answers
1k
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Can GR be derived by postulating a maximum force?
This paper was published in a peer review journal, and claims the answer is yes.
http://arxiv.org/abs/physics/0607090
The derivation in the paper seems more like dimensional analysis hand-waving in t …
- 2,155
18
votes
5
answers
1k
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Does GR provide a maximum electric field limit?
Does GR provide a limit to the maximum electric field?
I've gotten conflicting information regarding this, and am quite confused. I will try to quote exactly when possible so as not to confuse thin …
- 2,155
11
votes
1
answer
2k
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What all is needed to solve for the metric in GR?
Einstein's field equations are:
$R_{ab} - {1 \over 2}g_{ab}\,R + g_{ab} \Lambda = {8 \pi G \over c^4} T_{ab}$
And since the Ricci curvature tensor is "less information" than the Riemann curvature te …
- 2,155
1
vote
1
answer
704
views
Does change of coordinate system require acceleration?
This question came about from a side discussion that arose on this:
Does GR provide a maximum electric field limit?
Can we change our choice of coordinate system completely independent of physical mo …
- 2,155
15
votes
2
answers
2k
views
Can the Big Rip really rip apart an atomic nucleus?
Some scenarios describing the fate of the matter vs dark energy tug of war on the universe involve the acceleration of the universe increasing to the point that it ends up ripping apart even atoms. Th …
- 2,155
11
votes
2
answers
1k
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Can colliding gravitational waves create a black hole?
Whether gravitational waves are real or just a coordinate freedom was argued in the early days of GR. Eventually the conclusion was that they were real. And if they are 'real' then I'm curious if... …
- 2,155
8
votes
1
answer
314
views
Scale set by cosmological constant
Following on Jim Graber's answer to: Can the Big Rip really rip apart an atomic nucleus?
If the cosmological constant is large enough, even the ground state of a hydrogen atom can be affected. So wh …
- 2,155
1
vote
Curvature of Conical spacetime
Here is my attempt, hopefully people can learn from my mistakes or something (please leave comments, so that I can learn more)
From suggestion, I'll focus on 2+0 space. The parallel transport sounds …
- 2,155
9
votes
5
answers
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Curvature of Conical spacetime
Inspired by: Angular deficit
The 2+1 spacetime is easier for me to visualize, so let's use that here. (so I guess the cosmic string is now just a 'point' in space, but a 'line' in spacetime) Edward s …
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