https://doi.org/10.1140/epjp/s13360-020-00342-7
Regular Article
On-axis tidal forces in Kerr spacetime
1
Faculdade de Física, Universidade Federal do Pará, Belém, Pará, 66075-110, Brazil
2
Department of Mathematics, University of York, Heslington, York, YO10 5DD, UK
* e-mail: crispino@ufpa.br
Received:
27
September
2019
Accepted:
17
March
2020
Published online:
30
March
2020
Tidal forces are an important feature of general relativity, which are related to the curvature tensor. We analyze the tidal tensor in Kerr spacetime, with emphasis on the case along the symmetry axis of the Kerr black hole, noting that tidal forces may vanish at a certain point, unlike in the Schwarzschild spacetime, using Boyer–Lindquist coordinates. We study in detail the effects of vanishing tidal forces in a body constituted of dust infalling along the symmetry axis. We find the geodesic deviation equations and solve them, numerically and analytically, for motion along the symmetry axis of the Kerr geometry. We also point out that the intrinsic Gaussian curvature of the event horizon at the symmetry axis is equal to the component along this axis of the tidal tensor there.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
