True energy-momentum tensors are unique. Electrodynamics spin tensor is not zero

Details True energy-momentum tensors are unique. Electrodynamics spin tensor is not zero True energy-momentum tensors are unique. Electrodynamics spin tensor is not zero

2001-02-26

arxiv.org/abs/physics/0102084v2

Physics

Classical Physics

LaTeX, 12 pages, submitted to "J. Phys. A". I include new results which confirm the previous version

Scientific paper

A true energy-momentum tensor is unique and does not admit an addition of a term. The true electrodynamics' energy-momentum tensor is the Maxwell-Minkowski tensor. It cannot be got with the Lagrange formalism. The canonical energy-momentum and spin tensors are out of all relation to the physical reality. The true electrodynamics' spin tensor is not equal to a zero. So, electrodynamics' ponderomotive action comprises a force from the Maxwell stress tensor and a torque from the spin tensor. A gauge non-invariant expression for the spin tensor is presented and is used for a consideration of a circularly polarized standing wave. A circularly polarized light beam carries a spin angular momentum and an orbital angular momentum. So, we double the beams angular momentum. The Beths experiment is considered.

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