Conserved Current Densities, Localization Probabilities, and a New Global Gauge Symmetry of Klein-Gordon Fields

A. Mostafazadeh, F. Zamani

For free Klein-Gordon fields, we construct a one-parameter family of conserved current densities $J_a^{\mu }$, with $a\in (-1,1)$, and use the latter to yield a manifestly covariant expr…