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quant-ph2025
Probability Density in Relativistic Quantum Mechanics
Taeseung Choi, Yeong Deok Han
In the realm of relativistic quantum mechanics, we address a fundamental question: Which one, between the Dirac or the Foldy-Wouthuysen density, accurately provide a probability de…
quant-ph2024
Lorentz-covariance of Position Operator and its Eigenstates for a massive spin field
Taeseung Choi
We present a derivation of a position operator for a massive field with spin , expressed in a representation-independent form of the Poincaré group. Using the recently derive…