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Author Topic:   GRAVITY PROBLEMS -- off topic from {Falsifying a young Universe}
SuperNintendo Chalmers
Member (Idle past 5833 days)
Posts: 772
From: Bartlett, IL, USA
Joined: 12-27-2005


Message 181 of 205 (273928)
12-29-2005 5:52 PM
Reply to: Message 180 by Son Goku
12-29-2005 5:27 PM


Re: Understanding
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.

This message is a reply to:
 Message 180 by Son Goku, posted 12-29-2005 5:27 PM Son Goku has not replied

  
Son Goku
Inactive Member


Message 182 of 205 (273968)
12-29-2005 7:29 PM


Again, Schutz "A first course in General Relativity" and D'Inverno "Introducing Einstein's Relativity" would be the best.

  
madeofstarstuff
Member (Idle past 5929 days)
Posts: 47
Joined: 08-12-2005


Message 183 of 205 (274175)
12-30-2005 11:19 AM
Reply to: Message 178 by cavediver
12-29-2005 1:20 PM


Thanks
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.

This message is a reply to:
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simple 
Inactive Member


Message 184 of 205 (304154)
04-14-2006 6:07 AM
Reply to: Message 30 by RAZD
01-22-2005 12:27 PM


Re: exactly
quote:
I have noted before that gravity is probably the least understood mechanism in science ..
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?

This message is a reply to:
 Message 30 by RAZD, posted 01-22-2005 12:27 PM RAZD has replied

Replies to this message:
 Message 185 by Son Goku, posted 04-14-2006 7:44 AM simple has not replied
 Message 186 by RAZD, posted 04-15-2006 8:23 AM simple has replied

  
Son Goku
Inactive Member


Message 185 of 205 (304163)
04-14-2006 7:44 AM
Reply to: Message 184 by simple
04-14-2006 6:07 AM


Re: exactly
Well I'd say a moderately significant amount.
What kind of evidence do you want simple?

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 Message 184 by simple, posted 04-14-2006 6:07 AM simple has not replied

  
RAZD
Member (Idle past 1404 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 186 of 205 (304399)
04-15-2006 8:23 AM
Reply to: Message 184 by simple
04-14-2006 6:07 AM


evidence?
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.

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This message is a reply to:
 Message 184 by simple, posted 04-14-2006 6:07 AM simple has replied

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simple 
Inactive Member


Message 187 of 205 (310925)
05-11-2006 1:05 AM
Reply to: Message 186 by RAZD
04-15-2006 8:23 AM


Re: evidence?
quote:
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}?
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


Message 188 of 205 (313095)
05-18-2006 4:19 AM
Reply to: Message 1 by RAZD
01-15-2005 8:23 PM


Re: for cosmo
quote:
(2) the total failure to detect the gravity {force\wave\particle} at the quantum level ... no gravitons in spite of many years of looking and variety of ways to look for it.
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


Message 189 of 205 (313151)
05-18-2006 9:53 AM
Reply to: Message 188 by simple
05-18-2006 4:19 AM


Re: for cosmo
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

This message is a reply to:
 Message 188 by simple, posted 05-18-2006 4:19 AM simple has replied

Replies to this message:
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simple 
Inactive Member


Message 190 of 205 (313359)
05-18-2006 8:42 PM
Reply to: Message 189 by Son Goku
05-18-2006 9:53 AM


Re: for cosmo
That is interesting. So can we actually even say there is gravity for sure at that level?

This message is a reply to:
 Message 189 by Son Goku, posted 05-18-2006 9:53 AM Son Goku has replied

Replies to this message:
 Message 191 by Son Goku, posted 05-19-2006 8:59 AM simple has replied

  
Son Goku
Inactive Member


Message 191 of 205 (313474)
05-19-2006 8:59 AM
Reply to: Message 190 by simple
05-18-2006 8:42 PM


Re: for cosmo
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.

This message is a reply to:
 Message 190 by simple, posted 05-18-2006 8:42 PM simple has replied

Replies to this message:
 Message 192 by fallacycop, posted 05-19-2006 9:09 AM Son Goku has replied
 Message 205 by simple, posted 05-29-2006 2:05 AM Son Goku has not replied

  
fallacycop
Member (Idle past 5520 days)
Posts: 692
From: Fortaleza-CE Brazil
Joined: 02-18-2006


Message 192 of 205 (313477)
05-19-2006 9:09 AM
Reply to: Message 191 by Son Goku
05-19-2006 8:59 AM


6 Microns?
I'm curious about where does the 6 microns quote come from.

This message is a reply to:
 Message 191 by Son Goku, posted 05-19-2006 8:59 AM Son Goku has replied

Replies to this message:
 Message 193 by Son Goku, posted 05-19-2006 12:13 PM fallacycop has replied

  
Son Goku
Inactive Member


Message 193 of 205 (313522)
05-19-2006 12:13 PM
Reply to: Message 192 by fallacycop
05-19-2006 9:09 AM


Re: 6 Microns?
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.

This message is a reply to:
 Message 192 by fallacycop, posted 05-19-2006 9:09 AM fallacycop has replied

Replies to this message:
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 Message 195 by fallacycop, posted 05-19-2006 12:35 PM Son Goku has not replied

  
cavediver
Member (Idle past 3643 days)
Posts: 4129
From: UK
Joined: 06-16-2005


Message 194 of 205 (313529)
05-19-2006 12:26 PM
Reply to: Message 193 by Son Goku
05-19-2006 12:13 PM


Re: 6 Microns?
Great paper, but reminds me why I hate experimental physics

This message is a reply to:
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Replies to this message:
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fallacycop
Member (Idle past 5520 days)
Posts: 692
From: Fortaleza-CE Brazil
Joined: 02-18-2006


Message 195 of 205 (313533)
05-19-2006 12:35 PM
Reply to: Message 193 by Son Goku
05-19-2006 12:13 PM


Re: 6 Microns?
Interesting. I would've expected a paper like that to be published in hep-exp instead...

This message is a reply to:
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Replies to this message:
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