Proca Equations of a Massive Vector Boson Field

Abstract. Proca equation is a relativistic wave equation for a massive spin-1 particle. The weak interaction is transmitted by such kind of vector bosons. Also vector fields are used to describe spin-1 mesons (e.g. ρ and ω mesons). After a brief biography, the paper presents an introduction into relativistic field theory, including Klein-Gordon, Dirac, and Maxwell fields, allowing to understand this scientific achievement and some consequences for the theory of strong interactions as well as for Maxwell-Proca and Einstein-Proca theories. The modern approach of the nonzero photon mass and the superluminal radiation field are also mentioned. 1 Introduction and Short Biography A. Proca, one of the greatest physicists of 20th century, was born in Bucharest on October 16, 1897. Biographical details can be found in a book editted by his son [1], where his publications are reproduced; see also [2] the web site [3] with many links and W. Pauli’s biography [4]. He passed away in the same year wit