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Extra Dimensions in String Theory 
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#37
Nov506, 04:41 PM

Sci Advisor
P: 789

So, what odds are you giving me for finding KKparticles at LHC? Something like 1:100, and I'll consider taking it... Also, if we find a deviation from the 1/r^2gravity at small length scales, would you consider this as an indication of a "real" (although not universal) extra dimension ? 


#38
Nov506, 05:33 PM

P: 859




#39
Nov506, 05:48 PM

P: 859




#40
Nov506, 05:51 PM

P: 122

This is speculative:
1  a square might be decomposed into 4 equilateral triangles  if bent along the triangles, such symmetry and dimensions may be viewed, but if not bent, remaining planar, these triangles are obscured with only the square viewed 2  likewise a six sided cube may be decomposed into 24 equilateral triangles which might be bent into something resembling a torus by folding the top and bottom toward the interior while the frontback and leftright surfaces are folded outwards  but if not folded the equilateral triangles are obscured 


#41
Nov506, 06:42 PM

Sci Advisor
P: 789

Let's make it 1:1000 then? 


#42
Nov506, 06:44 PM

Sci Advisor
P: 789




#43
Nov506, 07:19 PM

P: 859




#44
Nov506, 07:20 PM

P: 859




#45
Nov606, 04:39 AM

Sci Advisor
P: 789

However, the theory predicts other properties of the particles. I guess this quite recent paper could be something to look at: http://www.arxiv.org/abs/hepph/0610057 Yes, the subject is about the extra dimensions indicated by string theory, but I guess you wouldn't say string theory is ruled out just because we happen to find KKparticles (in which case you agreed to call the extra dimension "real")? 


#46
Nov606, 04:42 AM

Sci Advisor
P: 789




#47
Nov606, 08:29 AM

P: 59

I did a Wiki search on LHC and didn't come up with anything physicsrelated  can someone tell me what LHC stands for?
Some of this discussion is going over my head, which is fine, but if I could make two points  The conversation is drifting back into "what is real" without an operational definition of "real". My particular interest is "what is necessary and sufficient to locate all points in an unbounded volume". Also, "real extra dimensions" is not a concept I object to  it's real extra spatial dimensions that I'm questioning. 


#48
Nov606, 08:55 AM

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P: 789

http://public.web.cern.ch/Public/Con...hatLHCen.html It's the most amazing machine humanity has ever built, and the physics community are eagerly waiting for it take up operation. 


#49
Nov606, 01:38 PM

P: 59

Thanks, EL. It certainly gives a sense of scale to realize that the power of 1150 mosquitos will create the most powerful atom smasher we've ever had. :)



#50
Nov606, 04:38 PM

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#51
Nov606, 04:38 PM

P: 70




#52
Nov606, 05:14 PM

Sci Advisor
P: 789

The data analysis at LHC is very complex, and lot's of different new physics models are quite degenerate. But of course there are always differences (otherwise they would be the same theory) which we can nail down better and better the more we get to know about the properties of the new particle. Remember that's only a five page paper not going into any details. Check the references (and the references in the references) for more details. 


#53
Nov606, 05:59 PM

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#54
Nov606, 06:18 PM

Sci Advisor
P: 789

So Kea, how much are you ready to bet?



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