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Equatorial circular orbits of neutral test particles in the Kerr-Newman spacetime

Daniela Pugliese1,*, Hernando Quevedo2,3,4,†, and Remo Ruffini2,‡

  • 1School of Mathematical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
  • 2Dipartimento di Fisica and ICRA, Università di Roma “La Sapienza,” Piazzale Aldo Moro 5, I-00185 Roma, Italy and ICRANet, Piazzale della Repubblica 10, I-65122 Pescara, Italy
  • 3Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70543, México, DF 04510, Mexico
  • 4Instituto de Cosmologia, Relatividade e Astrofisica and ICRANet-CBPF Rua Doutor Xavier Sigaud, 150, CEP 22290-180 Rio de Janeiro, Brazil

  • *d.pugliese.physics@gmail.com
  • †quevedo@nucleares.unam.mx
  • ‡ruffini@icra.it
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Phys. Rev. D 88, 024042 – Published 24 July, 2013

DOI: https://doi.org/10.1103/PhysRevD.88.024042

Abstract

We present a detailed analysis of the orbital circular motion of electrically neutral test particles on the equatorial plane of the Kerr-Newman spacetime. Many details of the motion in the cases of black hole and naked singularity sources are pointed out. We identify four different types of orbital regions, which depend on the properties of the orbital angular momentum, and define four different kinds of naked singularities, according to the values of the charge-to-mass ratio of the source. It is shown that the presence of a particular type of counterrotating test particle is sufficient to uniquely identify naked singularities. It is pointed out that the structure of the stability regions can be used to differentiate between black holes and naked singularities.

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See Also

Circular motion of neutral test particles in Reissner-Nordström spacetime

Daniela Pugliese, Hernando Quevedo, and Remo Ruffini
Phys. Rev. D 83, 024021 (2011)

Article Text

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Phys. Rev. D 88, 024042– Published 24 July, 2013
  • Received 26 March 2013

© 2013 American Physical Society

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