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Title: Lagrangian geometrical optics of nonadiabatic vector waves and spin particles

Journal Article · · Physics Letters. A

Linear vector waves, both quantum and classical, experience polarization-driven bending of ray trajectories and polarization dynamics that can be interpreted as the precession of the "wave spin". Here, both phenomena are governed by an effective gauge Hamiltonian vanishing in leading-order geometrical optics. This gauge Hamiltonian can be recognized as a generalization of the Stern-Gerlach Hamiltonian that is commonly known for spin-1/2 quantum particles. The corresponding reduced Lagrangians for continuous nondissipative waves and their geometrical-optics rays are derived from the fundamental wave Lagrangian. The resulting Euler-Lagrange equations can describe simultaneous interactions of N resonant modes, where N is arbitrary, and lead to equations for the wave spin, which happens to be an (N2 - 1)-dimensional spin vector. As a special case, classical equations for a Dirac particle (N = 2) are deduced formally, without introducing additional postulates or interpretations, from the Dirac quantum Lagrangian with the Pauli term. The model reproduces the Bargmann-Michel-Telegdi equations with added Stern-Gerlach force.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
DE274-FG52-08NA28553; AC02-09CH11466; FA9550-11-C-0028
OSTI ID:
1256634
Alternate ID(s):
OSTI ID: 1347252
Report Number(s):
PPPL-5144; PII: S0375960115006404
Journal Information:
Physics Letters. A, Vol. 379, Issue 38; ISSN 0375-9601
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (9)

Quasioptical modeling of wave beams with and without mode conversion. III. Numerical simulations of mode-converting beams journal July 2019
Quasioptical modeling of wave beams with and without mode conversion. II. Numerical simulations of single-mode beams journal July 2019
Quasioptical modeling of wave beams with and without mode conversion. I. Basic theory journal July 2019
Extending geometrical optics: A Lagrangian theory for vector waves journal May 2017
First-principle variational formulation of polarization effects in geometrical optics text January 2015
Massless polarized particle and Faraday rotation of light in the Schwarzschild spacetime journal July 2021
Relativistic ponderomotive Hamiltonian of a Dirac particle in a vacuum laser field text January 2015
Parametric decay of plasma waves near the upper-hybrid resonance text January 2017
Mode conversion in cold low-density plasma with a sheared magnetic field text January 2017

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