Classical Electron Radius
According to special relativity, mass mmm is equivalent to energy E=mc^2. How large must the radius of a spherically assumed electron be, assuming that its rest mass m originates solely from its electrostatic self-energy,
E = \frac{1}{2} \int dV \int dV' \frac{\rho(r) \rho(r')}{|\vec{r} - \vec{r}'|}
assuming that ρ(r)...
a) is homogeneous over the sphere,
b) is isotropically distributed over the surface of the sphere,
c) behaves like a point charge, i.e., ρ(r)∝δ(r−r_0), and what does this say about the limited well-definedness of the concept of self-energy in electrostatics? Discuss the issue mentioned in the lecture in connection with these points.
The electron mass is m=9.110×10^{−31} kg and e=−1.602×10^{−19} C.