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Author Topic:   General Relativity.
jmrozi1
Member (Idle past 5922 days)
Posts: 79
From: Maryland
Joined: 12-09-2005


Message 114 of 129 (269739)
12-15-2005 6:01 PM
Reply to: Message 113 by TimChase
12-06-2005 12:27 AM


Attractive Force or Warping of Space Time?
I don't know if this would be one of the aforementioned discredited theories, but I started reading an article about a possible misconception of gravity, and it mentioned gravity as a warping of space time rather than an attractive force. Supposedly, this theory is supposed to work the same as gravity and meet most of the same predictions, but could explain a select few of the anomolies as well.
Now, I'm not a complete idiot, but this theory doesn't make sense to me. It seems that if there are two objects that are initially stationary to the inertial reference frame, there shouldn't be any reason for the space between them to decrease unless the warping is continual. If this is the case, how could space time continue to warp without the aid of some sort of attractive force?
Somehow I don't think a student who took one Physics course would be able to challenge a theory developed by a team of physicists, so I'm obviously missing something. If anyone knows how this theory is supposed to work, I'm all ears.

This message is a reply to:
 Message 113 by TimChase, posted 12-06-2005 12:27 AM TimChase has replied

Replies to this message:
 Message 115 by Wounded King, posted 12-15-2005 6:25 PM jmrozi1 has replied
 Message 117 by TimChase, posted 12-15-2005 8:08 PM jmrozi1 has not replied
 Message 119 by cavediver, posted 12-15-2005 9:22 PM jmrozi1 has not replied

  
jmrozi1
Member (Idle past 5922 days)
Posts: 79
From: Maryland
Joined: 12-09-2005


Message 116 of 129 (269777)
12-15-2005 8:07 PM
Reply to: Message 115 by Wounded King
12-15-2005 6:25 PM


Re: Attractive Force or Warping of Space Time?
It sounds to me like you are describing the 'Rubber Sheet' view of gravity, the usual illustration being of a bowling ball sitting in a dip on a suspended rubber sheet.
Yeah, that's the one.
In fact, the bowling ball analogy was precisely how I arrived at my question. The explanation was that a straight line would always gravitate towards the center, and though it seems that given the correct orientation it would escape regardless, I let it go considering that the analogy might fail because it only explains the warping of a 2-dimensional space. The part that still bothers me, however, is that the only reason a stationary object should move towards the center is because of the continual warping of space time.
If this is the case, I guess my question would be how is that different than simply calling it an attractive force?

This message is a reply to:
 Message 115 by Wounded King, posted 12-15-2005 6:25 PM Wounded King has not replied

  
jmrozi1
Member (Idle past 5922 days)
Posts: 79
From: Maryland
Joined: 12-09-2005


Message 125 of 129 (270206)
12-16-2005 9:49 PM


What have I started?
it would be more appropriate to describe the bundle structure of spatial hypersurface fibres on the time base-space as having non-trivial connection
Yeah, I didn't think that describing it as curved could suffice.
Well, simply put, the geometry of space would still be Euclidean in much the same way as a Friedman model with critical mass density.
Thank god the difficult version wasn't explained...
General Relativity is a little tough as it is expressed in the language of pseudo-Riemannian geometry.
And to think I blamed it on my teacher.
unless of course you mean Roger Penrose's "twistor theory" which I suppose could be described as something along these lines.
But of course!
To any of you who didn't catch the sarcasm of my previous statements, I no longer have any idea what's going on. In actuality, my brain exploded (true story) when I read that first line. Still, I'm a little jealous of the genius level of physics knowledge displayed here, so I'm hoping that either of you might be able to recommend a few sources so that I might be able to better understand these concepts in the future (however distant).

Replies to this message:
 Message 126 by cavediver, posted 12-17-2005 5:37 PM jmrozi1 has not replied

  
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