I’m only half a layman, but I know that Brian Green (maybe others?), have put forward the idea that 11 dimensions do exist, it’s only that they are “curled up” and so small that we can’t (yet) observe them, analogues to how a wire might appear form afar, flat, but as you move close you see it’s actually a cylinder, Greens own example.
And why did they propose it, other than to explain why these extra dimensions are not observed in nature, thus patching up a model with a falsified prediction?
It predicted 10 or 11 dimensions, super-partners and other things.
I’m only half a layman, but I know that Brian Green (maybe others?), have put forward the idea that 11 dimensions do exist, it’s only that they are “curled up” and so small that we can’t (yet) observe them, analogues to how a wire might appear form afar, flat, but as you move close you see it’s actually a cylinder, Greens own example.
And why did they propose it, other than to explain why these extra dimensions are not observed in nature, thus patching up a model with a falsified prediction?
We haven’t ruled out supersymmetry yet.