Institute of Theoretical Physics · Faculty of Mathematics and Physics, Charles University
A&A 291(2), 679-686 (1994)
'Rotosphere', where the component of 4-acceleration, radial relative to the symmetry axis, of the stationary observer depends on his angular velocity in a way going against our intuition, is demarcated in the Kerr spacetime. Stationary observers with extremal value of this acceleration ('extremelly accelerated observers') are introduced and their privileged relation to circular geodesics in the equatorial plane is found. Possible translation of the results into 'force' language is based on the definition of the 'centrifugal force' with respect to the zero-angular-momentum observers. It yields, in particular, a simple interpretation of the behavior of acceleration of the stationary observer in terms of gravitational, Coriolis and centrifugal forces.
@article{UTF740,
author = {Semerák, O.},
title = {{On the competition of forces in the Kerr field}},
journal = {A\&A},
volume = {291},
number = {2},
pages = {679-686},
year = {1994},
month = {11},
}