While the nuclear and electromagnetic forces are bound to everyday 4space, gravity is not.
I am not aware of any tested theory of gravity that posits more than four dimensions. There is some speculation that closed strings could be related to gravity and that their ability to escape the brane might explain the weakness of gravity. However it is yet to be shown that ST predicts anything like observable universe at any accessible scale.
How is Electro/Magnatism (polarity) associated with strings? (grounded)
So far there is no direct connection between String Theory and Electro/Magnetism (or any other physically tested theory).
It should be kept in mind that if ST describes our universe it probably does so in the domain of Plank dimensions. All tested theories work at much larger scales and would reflect some form of composite behavior of the strings.
Not neccesarily. While the nuclear and electromagnetic forces are bound to everyday 4space, gravity is not. Since we've only measured the strength of gravity down to about 1mm, we can't rule out the other dimensions being curled up any more loosely than that. This potenial effect is why there's a chance that the upgraded LHC and high energy cosmic rays may occasionally be able to produce a quantum black hole.
IIRC, the "down to about 1mm" refers to deviations from an inverve square relationship; various other "strength of gravity" characteristics have been measured down to ~1 micron (e.g. weak equivalence principle?), with plans afoot to refine these (and other aspects) by at least two OOM (orders of magnitude), over the next few years.
While the nuclear and electromagnetic forces are bound to everyday 4space, gravity is not.
I am not aware of any tested theory of gravity that posits more than four dimensions. There is some speculation that closed strings could be related to gravity and that their ability to escape the brane might explain the weakness of gravity. However it is yet to be shown that ST predicts anything like observable universe at any accessible scale.
This isn't as good as the original article I read, which really tied everything together and mentioned what was special about gravity in superstring/M theories that allowed it to leak into the other dimensions while the other three forces could not. IT does however mention the cosmic ray/lhc detection of blackholes is dependent on the extra dimensions being large.
DanNeely:
You left out that the prediction is untested. I look forward to many interesting results from LHC and if this turns out to be one of them that would be great but unless/until that happens the predict phenomenon is speculative.
It also relies on the part of ST with the weakest theoretical justification i.e. the roll up of the ‘extra’ dimensions. So far as I have been able to determine no one has been able to show role up arises naturally from the basic theory of Super-Symmetric Strings. The roll up must be force on the theory as an external phenomenon. Such arbitrary add-ons imply that even if we get testable results the theory will remain incomplete.
RE: While the nuclear and
)
I am not aware of any tested theory of gravity that posits more than four dimensions. There is some speculation that closed strings could be related to gravity and that their ability to escape the brane might explain the weakness of gravity. However it is yet to be shown that ST predicts anything like observable universe at any accessible scale.
RE: RE: RE: How is
)
IIRC, the "down to about 1mm" refers to deviations from an inverve square relationship; various other "strength of gravity" characteristics have been measured down to ~1 micron (e.g. weak equivalence principle?), with plans afoot to refine these (and other aspects) by at least two OOM (orders of magnitude), over the next few years.
RE: RE: While the nuclear
)
This isn't as good as the original article I read, which really tied everything together and mentioned what was special about gravity in superstring/M theories that allowed it to leak into the other dimensions while the other three forces could not. IT does however mention the cosmic ray/lhc detection of blackholes is dependent on the extra dimensions being large.
http://golem.ph.utexas.edu/~distler/blog/archives/000408.html
DanNeely: You left out that
)
DanNeely:
You left out that the prediction is untested. I look forward to many interesting results from LHC and if this turns out to be one of them that would be great but unless/until that happens the predict phenomenon is speculative.
It also relies on the part of ST with the weakest theoretical justification i.e. the roll up of the ‘extra’ dimensions. So far as I have been able to determine no one has been able to show role up arises naturally from the basic theory of Super-Symmetric Strings. The roll up must be force on the theory as an external phenomenon. Such arbitrary add-ons imply that even if we get testable results the theory will remain incomplete.
RE: You left out that the
)
I felt that was implicit. my orginal posting was in response to your statement about the scale ST's predictions were Operating on.
I was simply pointing out that there was at least one prediction of out the ST models that was at the macroscopic and potentially testable level.
DanNeely: Point taken, sorry
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DanNeely:
Point taken, sorry if I belabored mine.
RE: DanNeely: Point taken,
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I thank you all with boundless gratitude!
God Bless
Ernie S
RE: DanNeely: Point taken,
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Not a problem.