ABSTRACT

A scalar uncharged particle in quantum field theory is known to be described by the wave equation ()□u=F(u), https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780367812027/499b2676-17a6-4805-9fd8-78c8baf0b813/content/eq742.tif"/>