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Ok. So coming back to my original 'twists in spacetime' fantasy, one could say that perhaps this fantasy could be dismissed as follows:
In a galaxy, phenomena such as Rotational Frame Dragging described by the Kerr Metric, the Penrose processes in the Ergosphere and Gravitomagnetic Effects are mainly localised to the rotating core, right ? (This is a scale question).
Wiki mentions that the Frame Dragging effect (for eg) is fairly weak, about 1 part in 10^12 so, I guess, just comparing the magnitude of this metric with the metric radius of a spiral arm, about 4.5 x 10^17 kms, (50k ly), something like Frame Dragging would only be localised to a bit over one part distance from the core and hence wouldn't play much/any of a role beyond that distance? (Is the logic right, here ?)
(I'm trying to get a feel for how much impact rotating galactic holes might have on the objects comprising the arms and thus, the rotation of the galaxy, due to their torque effects).
Cheers
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