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I think (because you talk about exiting from and entering into dimensions) you are referring to the conjecture that our universe is embedded in a hyperspace and

by d_tr 6y ago

I think (because you talk about exiting from and entering into dimensions) you are referring to the conjecture that our universe is embedded in a hyperspace and that gravitational pull from objects inside our universe could be detected by objects somewhere in that hyperspace (perhaps by objects living in other universes embedded in the same hyperspace). This is something entirely different from the conjecture that our universe could have additional, compact (i.e. "curled up") dimensions. Maybe you have mixed these two up? Regarding the first conjecture, the fact that the inverse square law holds over large distances might be due to the fact that we do not extend into the hyperspace, so we only "feel" the dispersion along two dimensions (hence inverse square law). Regarding the second one, the extra compact dimensions are supposed to be so extremely "small", that you would need to probe extremely small distances to find any anomalies. I do not think you can say that anything goes into and out of these extra compact dimensions any more than you can say that anything goes into and out of any of the three "large" dimensions. We are just moving along all these dimensions at the same time, all the time.

jscipione 6y ago
The two dimensions instead of three represented by the square part of the inverse square law is due to the fact that the surface of a sphere is 2 dimensional, not three dimensional. I don’t know physics well enough to dispute anything else you said but as I understand it only gravity interacts with the extra curled up dimensions, not magnetism or the strong and weak nuclear forces. How do physicists “know” this? No clue but as the article says, gravity behaves differently than the other three forces so there should be an experiment that can show the difference by measuring one thing for gravity and another for the other three forces. I understand that the experiment would have to be conducted over currently impossibly small distances to actually see the graviton disappear as it leaves our three extended dimensions and reappear as it comes back. I don’t understand why the effect wouldn’t be clear to see over cosmological distances but that most likely stems from my ignorance more than theirs.

by d_tr 6y ago

jscipione 6y ago

The two dimensions instead of three represented by the square part of the inverse square law is due to the fact that the surface of a sphere is 2 dimensional, not three dimensional. I don’t know physics well enough to dispute anything else you said but as I understand it only gravity interacts with the extra curled up dimensions, not magnetism or the strong and weak nuclear forces. How do physicists “know” this? No clue but as the article says, gravity behaves differently than the other three forces so there should be an experiment that can show the difference by measuring one thing for gravity and another for the other three forces. I understand that the experiment would have to be conducted over currently impossibly small distances to actually see the graviton disappear as it leaves our three extended dimensions and reappear as it comes back. I don’t understand why the effect wouldn’t be clear to see over cosmological distances but that most likely stems from my ignorance more than theirs.