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- W2967547700 abstract "A simple conserved quantity for electromagnetic fields in vacuum was discovered by Lipkin in 1964. In recent years this has been used as a measure of the chirality of light. The conservation of optical zilch is here derived from a simple symmetry of the standard electromagnetic action. The symmetry transformation allows the identification of circularly polarized plane waves as zilch eigenstates. The same symmetry is present for electromagnetism in a homogeneous, dispersive medium, allowing the derivation of the zilch density and flux in such a medium. Optical helicity density and flux are also derived for a homogeneous, dispersive medium. For monochromatic beams in vacuum, optical zilch is proportional to optical helicity. This monochromatic zilch-helicity relation acquires a factor of the square of the phase index in a dispersive medium." @default.
- W2967547700 created "2019-08-22" @default.
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- W2967547700 date "2013-03-04" @default.
- W2967547700 modified "2023-09-26" @default.
- W2967547700 title "Optical zilch and Noether's theorem" @default.
- W2967547700 hasPublicationYear "2013" @default.
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