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Extra Dimensions' dimensions 
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#1
Jun814, 06:15 PM

P: 760

I've heard that extra dimensions can be (due to gravitational experiments) of dimensions ~some millimeters...
I'm quiet skeptical about this issue... Why would someone choose gravity (such a weak force for those experiments) to determine the scale? why not use Electromagnetism , that has allowed us to see up to ~some Armstrong scale (seen the atoms)? with the last, we know that we haven't seen any extra dimensions up to that scale... Moreover on that, if the extra dimensions were really of order of some millimeters, then a dust of dirt could be completely erased from our world  being able to travel within those dimensions. It doesn't sound nice.... I am sorry if this belongs to Beyond SM, but it's not about "research". 


#2
Jun814, 07:11 PM

P: 355

This lets the "real" scale of gravity, i.e. the real Planck scale, be much lower than we usually expect, and can be a way to solve the hierarchy problem. But as I said it depends on some model details. 


#3
Jun914, 08:31 AM

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#4
Jun914, 10:00 AM

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P: 11,617

Extra Dimensions' dimensions
There is nothing wrong with a model of large extra dimensions that includes the electromagnetic interaction in them, but we already know we do not live in such a universe. 


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