Observer-dependent tidal indicators in the Kerr spacetime
arXiv:1408.5253 · doi:10.1088/0264-9381/29/5/055005
Abstract
The observer-dependent tidal effects associated with the electric and magnetic parts of the Riemann tensor with respect to an arbitrary family of observers are discussed in a general spacetime in terms of certain "tidal indicators." The features of such indicators are then explored by specializing our considerations to the family of stationary circularly rotating observers in the equatorial plane of the Kerr spacetime. There exist a number of observer families which are special for several reasons and for each of them such indicators are evaluated. The transformation laws of tidal indicators when passing from one observer to another are also discussed, clarifying the interplay among them. Our analysis shows that no equatorial plane circularly rotating observer in the Kerr spacetime can ever measure a vanishing tidal electric indicator, whereas the family of Carter's observers measures zero tidal magnetic indicator.
arXiv comment15 pages, 4 figures. Note that there is a misprint in Eq. (4.5) of the published version: the plus sign in front of the last term in the sum (at the beginning of the last line) should be a minus sign. The resulting Eq. (4.6) should be corrected too. However, these misprinted equations are only a re-writing of previous equations, so that the analysis of the tidal indicators is not affected. arXiv admin note: text overlap with arXiv:1306.4803
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