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Precession of spherical spin-1 vortices
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DOI：10.1063/5.0261868.png)
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Abstract
En 中文
A spin-1 vortex consists of the three time-dependent multipolar spherical modes associated with the three spherical harmonic functions of degree & ell;=1. The spin-1 vortex is basically the spherical Hicks-Moffatt vortex with an arbitrary orientation in the three-dimensional space. It is shown that, in the presence of a background flow with cylindrical swirl of arbitrary orientation and a background time-dependent radial expansion/contraction flow, the orientation of the spin-1 vortex precesses about an axis and with a frequency both prescribed by the background cylindrical flow. The time dependence of the precession frequency is prescribed by a background radial divergent flow. It is shown that this vortex precession in the presence of a constant background vorticity is analogous to the precession of the magnetic moment of a body in the presence of an external constant magnetic field, or Larmor precession.
Keywords:
VORTEX
