Covariant phase-space representation for localized light waves

Abstract
It is suggested that the light-cone coordinate system is the natural language for the Lorentz-covariant phase-space representation of quantum mechanics. The localized light wave is discussed as an illustrative example. It is shown that the unitary transformation of a localized light wave from one Lorentz frame to another can be achieved through its covariant phase-space representation.

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