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Wow! Check this paper out by Andrea Carati:Gravitational effects of the faraway matter on
the rotation curves of spiral galaxies
The math in this paper is way over my head.
An interesting quote from the conclusion:
It was shown here that the faraway matter can exert a force of such a magnitude
as to account for the observed rotation velocity curves in spiral galaxies,
if the force is assumed to be decorrelated beyond a sufficiently large distance,
of the order of 1 kpc. In particular we fit the rotation curves of the galaxies
NGC 3198, NGC 2403, UGC 2885 and NGC 4725 without any need to
introduce dark matter at all.
Anyone seen this type of analysis before?
Essentially far-off tidal effects?
Evidence in favour or against would probably have to come from a better calculation of the way matter is truly arranged. Isotropy is an oversimplication to be sure, but fractal distribution might be also. We should be able to predict rotation curves approaching a more Keplerian style in cases where isotropy is approximated, right?
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