# Newman-Janis Algorithm Revisited

@article{Brauer2015NewmanJanisAR,
title={Newman-Janis Algorithm Revisited},
author={Oscar Brauer and Hugo A. Camargo and Miguel Socolovsky},
journal={International Journal of Theoretical Physics},
year={2015},
volume={54},
pages={302-314}
}
• Published 2015
• Physics
• International Journal of Theoretical Physics
The purpose of the present article is to show that the Newman-Janis and Newman et al algorithm used to derive the Kerr and Kerr-Newman metrics respectively, automatically leads to the extension of the initial non negative polar radial coordinate r to a cartesian coordinate r′$r^{\prime }$ running from −∞$-\infty$ to +∞$+\infty$, thus introducing in a natural way the region −∞<r′<0$-\infty <r^{\prime }<0$ in the above spacetimes. Using Boyer-Lindquist and ellipsoidal coordinates, we discuss… Expand
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