The gravito-electromagnetic approximation to the gravimagnetic dipole and its velocity rotation curve

In view of the observed flat rotation curves spiral galaxies and motivated by simple fact that within newtonian gravity a stationary axisymmetric mass distribution or dark matter vortex finite extent readily displays somewhat flattened out velocity curve up to distances comparable such transverse galaxy's disk, possibility flattening may rather be manifestation some space-time curvature purely gravitational character, without need particles, is considered in case gravimagnetic dipole carrying opposite NUT charges tensionless limit its Misner string, as an exact vacuum solution Einstein's equations. Aiming for first assessment potential suggestion easier than full fledged study geodesics, situation analysed limits weak field gravito-electromagnetism nonrelativistic dynamics. Thereby leading indeed interesting encouraging results.