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How many dimensions are there, really?by Ductaper
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#19
Jun2904, 03:37 PM

P: 51

Talking dimensions like this, i.e. as if the number of dimensions might be (locally?) variable. Is there anybody who have analysed the possibility of this? It seems that our nice inverse square laws puts strict limits to such schemes, no?



#20
Jun3004, 12:07 AM

P: 915

If we can change the way we see the nature of all particles as in their windings, then what signatures could we have given any element? Is it not universal then? 


#21
Jun3004, 04:50 AM

P: 258

how many dimensions are there, really?
There are only Three Dimensions, any more and Proton Decay would make everybody's life a nightmare! One can see that dimensional makeup follows in threefold steps. Third Dimension. The proton occupies the most stable Dimension, the third, this is why every combination of Quark interactions and existence occurs in THREE'S, and why all matter is in Phase across this dimensional domain. Second Dimension. Preceeds the first in all aspects Proton(MATTER) construction, and is by definition a Field. Matter can exist within a Field, but a field cannot exist within a Particle(Proton for instance), so theoretically 2D fields surround matter at all times. Try and think of any field that is internal/inside matter?..you will arrive at a duality. First Dimension. The singularity where all 2D componants are seperated into base 'monospace', 'everything' is everything else. AntiMatter is Matter and Matter is AntiMatter, everything is ONE. 


#22
Jun3004, 09:43 AM

P: 915

There are a couple of images that are immediately triggered in my mind to support my post above yours, yet something in what you said also triggerred another image. http://www.auriga.lnl.infn.it/auriga/guy_wave.jpg http://physicsforums.com/showpost.ph...83&postcount=6 Think of the graviton as the fellow? How would your assessment in dimenison speak to this unfolding? http://www.cerncourier.com/objects/2...desy1_403.jpg 


#23
Dec3109, 07:22 PM

P: 2

String theory has afforded mankind an incalculable benefit. It has been such a brashly sexy field that it has doubtless kept stringmeisters off of Wall Street. Can you imagine some mathwhiz inventing an "exotic financial instrument" to suck liquidity out of parallel universes? And such a thing succeding, causing inflation so astronomical that the Planckdollar is the new currency



#24
Jan2811, 10:43 AM

P: 100

What you and I observe on a daytoday basis is described as a (3+1=4)d universe. When people were first doing (bosonic (i.e. no fermions)) string theory, they discovered that there had to be extra dimensions that were compactified (curled up on themselves) with a small radius. In order to prevent a technical problem (known as anomalies) from happening in the theory, it was discovered that there had to be exactly 26 dimensions. When the same calculations were repeated with superstring theory (which DOES allow for a description of fermions), that number was found to be 10. It was later discovered that the various kinds of string theory were a particular limit of what's come to be known as Mtheory, which is still illdefined and poorly understood. However, it IS known that Mtheory lives in a 11d spacetime. I don't know what the status of anomaly cancellation in 11d is.
Now, the extra dimension that's added in Mtheory is (I think) taken to be decently larger than the other 6 added for string theory. Thus, in energy scales where you can't probe the 6 of string theory but you CAN probe the extra one of Mtheory, you'd end up doing well for yourself with an approximately 5d description of the universe. Sometimes you see models like that around as well. 


#25
Jan2811, 01:12 PM

P: 216

If the Holographic Universe is right our dimensions are the illusion. 


#26
Jan2811, 04:05 PM

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P: 11,155

Since this old thread has been revived, I suppose it wouldn't be inappropriate to insert a little humor that appeared elsewhere recently:
http://xkcd.com/848/ 


#27
Jan2911, 04:14 PM

P: 87

Physical experimental data says 3 spacial dimensions and 1 time dimension. There are folks exploring math ideas about higher dimension universes. There is currently no experimental data to back any of them up.



#28
Feb1011, 02:36 PM

P: 24

I think Paul Davies was actually begging the question. If there is order, then it can be mathematically described. But due to the randomness of nature, you can't always say that something exists here and now.
Netme: "So we exist within a 4 dimension+ universe? How can this be if we can only function viewing the universe in 3d. Wouldnt functioning be impossible?" I function quite nicely viewing the universe in 4 dimensions. While my ability to interact is limited to the present, and to a limited extent, the future; I can view the entire past that intersects with my 4 dimensional personal space within the spacetime continuum. It's called memory. Referring back to meteor's comment, a particle would not be able to "leap" to another dimension if it exists in all dimensions simultaneously. Which would also pose a problem with Heim Theory conjecture that an object could phase into a higher dimension to travel faster than light. I'm not sure of the math, but I think what it would look like on paper is a drop in all 3 physical dimensions to zero, becoming a "dimensionless" point; but to balance the equation, the other, "nonphysical" dimensions would have to change. Can a dimensionless point move within our spacetime continuum at faster than light speeds? I suppose it could if it has zero mass. But if an object's dimensions approached zero, it's density would approach infinity. At some point, it would become a black hole, with an event horizon. Can a black hole shrink in size? And can an event horizon move at FLT speeds? 


#29
May1411, 10:24 PM

P: 12

there has to be some kind of "friction point" where 'stuff' from other dimensions interact with our 3 dimesional Observable Universe. If there is no "friction point" then why do we care about these mathematical creations called dimensions? They don't have an effect on us. If they do have an effect on us...where is that "friction point". A simple example to me would be showing me how the 4th dimension called time actually interfaces with my 3D world. I see the results of "time" but never observe it itself. That makes it very easy to say that dimensions are imaginary, vaguely useful, and easily ignored. Trodding down the multidimensional path could lead to madness....lol.



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