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Petrov, A.Z. (2000) The Classification of Spaces Defining Gravitational Fields. General Relativity and Gravitation, 32, 1665-1685.
https://doi.org/10.1023/a:1001910908054

has been cited by the following article:

• TITLE: Principal Equatorial Null Geodesic Congruences in the Kerr Metric, and Their Quantum Propagators

  AUTHORS: Josué G. Mateos Trujillo, Miguel Socolovsky

  KEYWORDS: Kerr Metric, Principal Null Geodesics, Propagators

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.10 No.3, June 28, 2024

  ABSTRACT: Using the Raychaudhuri equation, we associate quantum probability amplitudes (propagators) to equatorial principal ingoing and outgoing null geodesic congruences in the Kerr metric. The expansion scalars diverge at the ring singularity; however, the propagators remain finite, which is an indication that at the quantum level singularities might disappear or, at least, become softened.