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Paper   IPM / Nano-Sciences / 17008
School of Astronomy
  Title:   Gravitomagnetic helicity
1.  Donato . Bini
2.  Bahram . Mashhoon
3.  Yuri N. Obukhov
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  105
  Year:  2022
  Supported by:            ipm IPM
Mass currents in astrophysics generate gravitomagnetic fields of enormous complexity. Gravitomagnetic helicity, in direct analogy with magnetic helicity, is a measure of entwining of the gravitomagnetic field lines. We discuss gravitomagnetic helicity within the gravitoelectromagnetic (GEM) framework of linearized general relativity. Furthermore, we employ the spacetime curvature approach to GEM in order to determine the gravitomagnetic helicity for static observers in Kerr spacetime.

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