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quant-ph2026
Subluminal and superluminal velocities of free-space photons
Konstantin Y. Bliokh
We consider rectilinear free-space propagation of electromagnetic wavepackets using electromagnetic field theory, scalar wavepacket propagation, and quantum-mechanical formalism. W…
quant-ph2026
Expectation Pauli-Lubanski vector and intrinsic angular momentum of relativistic wavepackets
Konstantin Y. Bliokh
In non-relativistic mechanics, the total (orbital) angular momentum (AM) of a spatially-distributed system can be decomposed into intrinsic and extrinsic contributions. In relativi…
quant-ph2024
On the Ehrenfest theorem and centroids of relativistic particles
Konstantin Y. Bliokh
We consider relativistic versions of the Ehrenfest relation between the expectation values of the coordinate and momentum of a quantum particle in free space: $d\langle {\bf r} \ra…