I am currently trying to understand the river model for a Kerr black hole. There is one concept I don't grasp yet. What does it mean for the spatial metric to be sheared in the given context. I am referring to the section "C. River tetrad" of the paper The river model of black holes. I also couldn't make any sense of the tilting lines which apparently are representing the shear of the spatial metric in figure 2. Sets of horizontal radial and azimuthal tetrad axes

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    $\begingroup$ I would also love to know this, I tried to read this paper many years ago. The author speaks of a "twist", but IMO fails to describe in what sense he means. Is it twisting out of the plane, about what axis etc. $\endgroup$ – m4r35n357 Dec 6 '19 at 10:47

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