|Jan16-12, 05:49 PM||#1| Galactic frame dragging Do galaxies
produce measurable/significant frame dragging effects by their
rotation? I would think frame dragging depends on the mass and
speed of rotation... Are such effects only felt at the boundary
between rotating gravitational fields and flatter space, i.e.
the edge of the milky way? Or would frame dragging produce
effects throughout the milky way, i.e. in the gaps between
spiral arms as well as between stars. |Jan16-12, 08:31 PM||#2|
These effects are completely negligible on the galactic scale.
Frame dragging is only significant near the event horizon of a
black hole. For comparison, if the entire mass of a galaxy were
compressed to a point; its event horizon would be about a
million times smaller than the radius of the galaxy, suggesting
the effects will be completely negligible. You're right that the
degree of the effect depends only on the mass and speed of
rotation (generally measured by the angular momentum). What
(little) effects there are would b