It was shown by Paul Ehrenfest in 1917 that Coulomb interaction is unstable at spatial dimensions higher than three,
- P. Ehrenfest, In what way does it become manifest in the fundamental laws of physics that space has three dimensions?, Proc. Netherlands Acad. Arts Sci., 20 (1917), 200 - 209 (pdf).
*P. Ehrenfest, In what way does it become manifest in the fundamental laws of physics that space has three dimensions?, Proc. Netherlands Acad. Arts Sci., 20 (1917), 200 - 209.(pdf)To quote:
In $R_n$ for $n>3$ the planet falls on the attracting centre or flies away infinitely. In $R_n$ for $n>3$ there do not exist motions comparable with the elliptic motion in $R_3$,- all trajectories have the character of spirals.
This analysis has been extended to quantum mechanics in
- Tangherlini, F. R. (1963). Schwarzschild field innin $n$ dimensions and the dimensionality of space problem, Nuovo Cimento. 14 (27): 636 https://doi.org/10.1007%2FBF02784569