Speaker
Description
Photon vortices caring orbital angular momentum (OAM) [1] with a wave function of Laguerre Gaussian (LG) wave or Bessel wave are one of the most interesting topics in various fields of physics. The interaction between a photon vortex and a material such nucleus may be different from that with standard photons because the photon vortex is the eigen-state of the z-component of the total angular momentum when the photon goes along z-axis. It is expected that photon vortices are created in astronomical systems such as black holes [2]. Gamma-ray bursts (GRBs) are one of the most energetic explosive phenomena in the universe, where highly linear (circular) polarization in the energy region of several hundred keV was observed. It may be generated by synchrotron radiations from relativistic electrons under strong magnetic fields.
The harmonic radiations from a spiral moving electron under a uniform magnetic field is a candidate for photon vortex production. We have theoretically presented that photon vortices are predominantly generated in astrophysical environments with strong magnetic fields such as magnetars or magnetized accretion disks around black holes [3]. This suggests that nucleosynthesis with photons should be changed from that with standard photons. A photon vortex is generated through a transition of an electron between two Landau levels and has a Bessel wave-function. We also calculate the decay widths from an electron in Landau levels and the energy spectra. The present result suggests a possibility that magnetic fields in neutron stars such as magnetar play an important role in the interpretation of many observed phenomena. Magnetars show properties different than normal neutron stars. Particularly large luminosity of photon and neutrino emission attract attention from many researchers. We also discuss a possible method using Compton scattering to identify photon vortices from the universe [4].
[1] L. Allen, et al. Phys. Rev. A 45, 8185 (1992).
[2] F. Tamburini, et al. Nature Phys. 7, 195 (2011).
[3] T. Maruyama, et al. Phys. Lett. B826. 136779 (2022).
[4] T. Maruyama, et al. Sci. Rep. 9, 51 (2019).
| Please select a main topic related to your abstract | Astronomical Observations with Light, X-Ray, Gamma-Ray, and Cosmic-Ray |
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