The angular momentum of electron radiation in a uniform magnetic field. (English) Zbl 1521.81065
Summary: We study theoretically by means of quantum electrodynamics the vortex radiation of a relativistic electron in a uniform magnetic field. The exact expressions for the probability of emission of a photon with a certain angular momentum are found. The classical asymptotics \(\hbar\to0\) of this probability does not match the angular momentum flux density calculated by the classical method using the symmetrized energy-momentum tensor. Although the flux of angular momentum integrated over the radiation directions is the same in both cases. We found the angular momentum flux of the radiation field using the canonical (not symmetrized) energy-momentum tensor and showed that the flux obtained in this way coincides with the classical limit for the probability of photon emission.
MSC:
| 81Q05 | Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics |
| 81R25 | Spinor and twistor methods applied to problems in quantum theory |
| 76M23 | Vortex methods applied to problems in fluid mechanics |
| 70M20 | Orbital mechanics |
| 81V10 | Electromagnetic interaction; quantum electrodynamics |
| 78A35 | Motion of charged particles |
| 78A40 | Waves and radiation in optics and electromagnetic theory |
| 81V80 | Quantum optics |
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