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Member (Idle past 1426 days) Posts: 20714 From: the other end of the sidewalk Joined: |
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Author | Topic: GRAVITY PROBLEMS -- off topic from {Falsifying a young Universe} | |||||||||||||||||||||||
SuperNintendo Chalmers Member (Idle past 5855 days) Posts: 772 From: Bartlett, IL, USA Joined: |
Mostly relativistics...
I had to take three semesters of physics in college so I am well versed in mechanics, heat, electricity, magnetism, etc.. (at least I used to be)... General relativity would probably be a good place to start.
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Son Goku Inactive Member |
Again, Schutz "A first course in General Relativity" and D'Inverno "Introducing Einstein's Relativity" would be the best.
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madeofstarstuff Member (Idle past 5950 days) Posts: 47 Joined: |
Cavediver:
if you want to really understand this stuff, do not let a sentence or equation go by without understanding it That is my method so far, I have derived all of the equations myself from the given assumptions regarding both the composition law of velocities and the Lorentz Transformations. Its easier to recall the specifics of a situation if you can derive it yourself from reasoning alone rather than just memorization.
when that understanding starts to dawn, you'll appreciate why relativists don't waste money on LSD Thats what intrigues me most about it, it seems the sky is the limit after a good understanding of this material. A lifetime of constant developments and insights into how the universe goes about presenting itself to us. Thanks again both of you.
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simple  Inactive Member |
quote: Can you think of any solid reasons that we actually know there was gravity in the earth's past? Say, before Egypt. Is there any evidence it existed then?
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Son Goku Inactive Member |
Well I'd say a moderately significant amount.
What kind of evidence do you want simple?
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RAZD Member (Idle past 1426 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Can you think of any solid reasons that we actually know there was gravity in the earth's past? Say, before Egypt. Is there any evidence it existed then? How about that the earth existed before egypt (Could it do that without gravity)? The lack of any evidence of gravity changing? All the fossils where organisms were buried by {landslides\mudslides\lava}? Welcome to the fray. we are limited in our ability to understand by our ability to understand RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ... to share.
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simple  Inactive Member |
quote: If it was stationary, perhaps? Maybe that's how the pyramids were built. Evidence of gravity, or electricity, or other forces in the past might be hard to come by.Having things buried doen't tell us that the force in place at the time was equal to present gravity, and that it applied to much more than the surface of the earth. If there was a water layer up there, maybe it didn't much apply to that? This post rendered invisible by AdminModulous - The 'simple' saga continues. The irony is, had simple decided to opt for the temporary suspension he'd have been reinstated several times over by now. The curious can click the Peek Button to view the post. This message has been edited by AdminModulous, Thu, 11-May-2006 08:06 AM
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simple  Inactive Member |
quote:So, you are claiming here that there is no gravity that we can detect at the quantum level?
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Son Goku Inactive Member |
So, you are claiming here that there is no gravity that we can detect at the quantum level?
Nobody has every tried because our equipment isn't sensitive enough.Nobody has ever looked for gravitons. Edited by Son Goku, : Spelling error
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simple  Inactive Member |
That is interesting. So can we actually even say there is gravity for sure at that level?
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Son Goku Inactive Member |
There is gravity until at least six micrometers (0.000006 meters), but at the actual quantum mechanical level we can't be certain if there is.
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fallacycop Member (Idle past 5541 days) Posts: 692 From: Fortaleza-CE Brazil Joined: |
I'm curious about where does the 6 microns quote come from.
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Son Goku Inactive Member |
No webpage found at provided URL: http://arxiv.org/pdf/hep-ph/0508204
It puts a constraint on modifications to Newtonian Gravity beneath that scale.
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cavediver Member (Idle past 3664 days) Posts: 4129 From: UK Joined: |
Great paper, but reminds me why I hate experimental physics
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fallacycop Member (Idle past 5541 days) Posts: 692 From: Fortaleza-CE Brazil Joined: |
Interesting. I would've expected a paper like that to be published in hep-exp instead...
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