[FRIAM] how seriously ...

[uǝlƃ ↙↙↙]

... should we take this?

Galactic rotation curve and dark matter according to gravitomagnetism
https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-021-08967-3

> Abstract Historically,  the  existence  of  dark  matter  has been postulated to resolve discrepancies between astrophysical observations and accepted theories of gravity. In particular, the measured rotation curve of galaxies provided much experimental support to the dark matter concept. However,most theories used to explain the rotation curve have been restricted to the Newtonian potential framework, disregarding the general relativistic corrections associated with mass currents. In this paper it is shown that the gravitomagnetic field  produced  by  the  currents  modifies  the  galactic  rotation curve, notably at large distances. The coupling between the Newtonian potential and the gravitomagnetic flux func-tion results in a nonlinear differential equation that relates the  rotation  velocity  to  the  mass  density.  The  solution  ofthis equation reproduces the galactic rotation curve without recourse  to  obscure  dark  matter  components,  as  exemplified by three characteristic cases. A bi-dimensional model is developed that allows to estimate the total mass, the central mass density, and the overall shape of the galaxies, while fit-ting the measured luminosity and rotation curves. The effects attributed to dark matter can be simply explained by the gravitomagnetic field produced by the mass currents.

I'd never even heard of the Lense-Thirring effect:
https://en.wikipedia.org/wiki/Lense%E2%80%93Thirring_precession

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