Bill_K said:
Pointlike means a three-dimensional object which current theory predicts to be a mathematical point (zero size, but still three-dimensional!). Current experimental evidence is consistent with this, meaning that if the particle does have a nonzero size, that size would have to be smaller than anything we have been able to detect.
The resolving power of an experiment (a collision, say) improves as you increase the energy. The best knowledge we have comes from the LHC, with energies in the TeV range, corresponding to a resolving power of the order 10-17 cm. And we have not yet seen any indication, so any nonzero size would have to be smaller than that.
I think you and Drakkith both missed the point. Quantum physicists always say and warn us that size in quantum world and on quantum level do not have much meaning-nobody explained, why?
It seems to me more and more that definition of physical size and physical dimensions on sub-atomic level and on quantum level is not physical size on macroscopic level.
So, the man question is: do all the sub-atomic particles have physical size and physical dimensions at all?
It seems to me when it comes purely physical size and physical dimensions we can talk about only for macroscopic world/classic physics/general and special theory of relativity, while physical size and physical dimensions do not exist at all on quantum level (quantum physics/mechanics)?
Do physicists mean that when they repeatedly say physical size and physical dimensions do not mean much or they do not mean anything at all on sub-atomic and quantum level?
What do scientists exactly mean when they say physical size and physical dimensions do not mean much or they both do not mean anything at all on sub-atomic and quantum level?
Big thanks to all.
Besides like I said gravity and all other fundamental forces (electromagnetism, weak nuclear force, strong nuclear force), and all forms of energy, as well the energy itself do not have physical size and do not have physical dimensions at all, since they are not physical objects, they do not take up space, they do not have volumes, we can only see their effects and influences on space/environment.
Black hole's event horizon is not the size of gravity, it is the result, the effect and the influence of extreme gravitational force, but gravity/gravitational force itself does not have any kind of physical size/dimensions.
Like I said before, event horizon of the black hole and the black hole itself both have size and volume (radius and diameter), but both event horizon of the black hole and the black hole itself are both effects, results and influences and "products" of (extreme) gravity, but not the gravity/gravitational force/energy itself.