The Center for Postgraduate Studies and Research congratulates Yang Ziou and Associate Professor Dr. Lim Yen Kheng from XMUM Department of Physics for the recent article published in Physical Review D, a Q1 journal with a latest impact factor of 5.407.

Entitled “Structure of test magnetic fields and charged particle motion in the Hayward spacetime”,the study is about the nature of electromagnetic interactions in a non-singular spacetime first discovered by Hayward in 2006. The exterior of the spacetime approximates the well-known Schwarzschild solution. Hence, it may be possible that the Hayward spacetime can mimic astrophysical black holes.

The article can be accessed at https://journals.aps.org/prd/abstract/10.1103/PhysRevD.105.124045.

The Arxiv preprint can be found at https://arxiv.org/abs/2203.12124v2

Solving Maxwell’s equation on Hayward’s spacetime yields interesting magnetic field configurations, such as the one shown in Figure 1. This figure shows the magnetic field configuration of the horizon-less Hayward spacetime. The two blue diamonds in the figure indicate points of zero magnetic field, and a charged particle can be trapped in a region around these two points.

Figure 1

Charged particles with higher velocity makes their characteristic cyclotron loops encircling the magnetic field lines, which is the typical behavior of any charged particle interacting with a magnetic field. However, the dipole configuration of the magnetic field results in particle orbits shaped like onions, or pumpkins, as shown in Figure 2.

Figure 2: The left panels of the figure depict the magnetic field (red arrows) and the particle motion (blue curve) in cylindrical coordinates where the azimuthal direction is suppressed. The right panels depict the corresponding orbits in Cartesian-like coordinates.

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