# Proposed physical explanation for the electron spin and related antisymmetry. (arXiv:1707.08674v2 [quant-ph] UPDATED)

We offer a possible physical explanation for the origin of the electron spin

and the related antisymmetry of the wave function for a two-electron system, in

the framework of nonrelativistic quantum mechanics as provided by linear

stochastic electrodynamics. A consideration of the separate coupling of the

electron to circularly polarized modes of the random electromagnetic vacuum

field, allows to disclose the spin angular momentum and the associated magnetic

moment with a $g$-factor 2, and to establish the connection with the usual

operator formalism. The spin operator turns out to be the generator of internal

rotations, in the corresponding coordinate representation. In a bipartite

system, the distinction between exchange of particle coordinates (which include

the internal rotation angle) and exchange of states becomes crucial. Following

the analysis of the respective symmetry properties, the electrons are shown to

couple in antiphase to the same vacuum field modes. This finding, encoded in

the antisymmetry of the wave function, provides a physical rationale for the

Pauli principle. The extension of our results to a multipartite system is

briefly discussed.