All Questions
8
questions
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votes
3
answers
491
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Can gravity exist without time?
I have read this question:
I think it's the opposite - when there is no gravity, the difference in time observers measure only depends on their relative velocity. It's when gravity gets very strong ...
- 29k
1
vote
2
answers
212
views
If gravity is spacetime curvature, and spacetime doesn't show any discreteness, then gravity doesn't show any discreteness and can't be quantized?
I am not asking about why or how gravity should be quantized, or what the problem with renormalization is, or what the discrepancy is between QM and GR is. Those are beautifully described in other ...
- 29k
2
votes
0
answers
56
views
Exponentially small effects in black hole physics
On page 60 of the following paper1, it is written:
But in gravity, due to exponentially small effects of $O(\exp(−Area/G_N ))$, associated with black-hole physics, even these dressed versions of ...
- 649
0
votes
0
answers
101
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Does the existence of graviton contradict gravity being spacetime curvature? [duplicate]
Is gravity a property-curvature of space-time it's self as descriped in GR?
Or the notion of 'graviton' is necessary in order to embed the 'classical GR theory' to the quantum's mechanics 'world' ...
user98038
0
votes
1
answer
232
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How does gravity cause acceleration? Also what means spacetime? [duplicate]
Since gravity only curves spacetime, how does it give kinetic energy to an object eg when an object falls to the ground. Since it only curves spacetime we shouldn't move towards it without kinetic ...
-1
votes
2
answers
418
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Atomic Weight and Time Dilation
So, this might sound kind of ridiculous but I was thinking about Relativity and since Gravity is a warping of Space-Time, or Time Dilation, why don't we measure Atomic Mass in Units of Time Dilation? ...
2
votes
2
answers
581
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Can gravity prevent quantum superposition of positions for a massive object?
Theoretically, nothing prevents a really massive object to be in a superposition of two spatial locations, even far away one from the other. Then I guess spacetime would also show the superposition of ...
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16
votes
7
answers
4k
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How can space and time arise from nothing?
Lawrence Krauss said this on an Australian Q&A programme.
"...when you apply quantum mechanics to gravity, space itself can arise from nothing as can time..."
Can you elaborate on this please?
...
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