Some remarks on the "needle radiation"

Abstract

It is shown that the classical wave equation is lacking solutions corresponding to the concept of "needle-radiation", while the simplest augmented version of the wave equation -- essentially the Klein-Gordon equation -- obtained by adding a linear term, does have such a solution.

arXiv commentThis paper has been withdrawn by the author, because Dr. Lutz Polley called his attention that the solution of Klein-Gordon equation considered belongs to the inhomogeneous equation with a delta-function source at the z-axis, and not to the homogeneous one