Spin and angular momentum operators and their conservation

Details Spin and angular momentum operators and their conservation Spin and angular momentum operators and their conservation

2009-02-05

arxiv.org/abs/0902.0938v1

Physics

Optics

Submitted to Journal of Optics A: Pure and Applied Optics

Scientific paper

Lorentz's reciprocity lemma and Feld-Tai reciprocity theorem show the effect of interchanging the action and reaction in Maxwell's equations. We derive a free-space version of these reciprocity relations which generalizes the conservation of the momentum-energy tensor. This relation corresponds to the interference conservation of electromagnetic waves. We show that for any transformation or symmetry that leaves Maxwell's equations invariant, we can modify the reciprocity relation to introduce a conserving density, optical flux and stress tensor extending Noether's theorem to a different context. We apply this method to transformations that can be expressed as Hermitian operators and more specifically we define the operators associated with the optical energy, spin, linear and angular momentum.

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