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@cartographer @stephenserjeant @NatureAstronomy
Could galaxy motions detect #CosmicTopology ?
Yes: #TopologicalAcceleration is known since 2007 [1]. But Newtonian approx. to gravity in S^3 requires replacing
F ∝ 1/r^2
by
F ∝ 1/(sin r)^2
and 1/(sin r)^2 in S^3 gives paradox: repulsive point mass @antipode [2]. A better Newtonian-like limit is needed. For a hint see [3][4]. :)
[1] https://ui.adsabs.harvard.edu/abs/2007A%26A...463..861R
[2] https://ui.adsabs.harvard.edu/abs/2009A%26A...502...27R