I New paper gravitomagnetism explains dark matter effects

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The paper by G. O. Ludwig proposes that gravitomagnetism, a concept from General Relativity (GR), can explain galaxy rotation curves without invoking dark matter, similar to Modified Newtonian Dynamics (MOND). While the basic idea of gravitomagnetic effects is valid and predicted by GR, the accuracy of the paper's estimates for these effects in rotating disk-shaped galaxies remains uncertain and requires further verification by researchers. Discussions highlight that gravitomagnetic effects are not simply attractive like gravity and do not merely alter the magnitude of a central force. The complexity of these effects parallels that of ordinary magnetism. Overall, the implications of this study could significantly influence the understanding of dark matter phenomena in astrophysics.
kodama
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Models of galactic rotation curves built of a general relativistic framework could use gravitomagnetism to explain the effects of dark matter
I'm not sure if this paper belongs in GR or astrophysics but

This articleG. O. Ludwig (2021), Galactic Rotation Curve and Dark Matter According to Gravitomagnetism, European Physical Journal C 81:186, DOI 10.1140/epjc/s10052-021-08967-3

there's no need for dark matter,as GR's Gravitomagnetism could explain galaxy rotation effects, similar in spirit to MOND, but using just plain GR.

could GR experts weigh in on this
 
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The basic idea of gravitomagnetic effects is valid; GR does predict them. The question is whether the paper's estimate of their magnitude for a rotating disk-shaped galaxy is correct. I think it will take some time for other researchers to check the work.
 
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PeterDonis said:
The basic idea of gravitomagnetic effects is valid; GR does predict them. The question is whether the paper's estimate of their magnitude for a rotating disk-shaped galaxy is correct. I think it will take some time for other researchers to check the work.

is gravitomagnetic effects always attractive like gravity, and therefore add up?
 
kodama said:
is gravitomagnetic effects always attractive like gravity

No. The effects in general are not as simple as just changing the magnitude of a central force. (That is also true of ordinary magnetism.)
 

Thread 'Jackson: justification of the Poynting vector by GR'

The Poynting vector is a definition, that is supposed to represent the energy flow at each point. Unfortunately, the only observable effect caused by the Poynting vector is through the energy variation in a volume subject to an energy flux through its surface, that is, the Poynting theorem. As a curl could be added to the Poynting vector without changing the Poynting theorem, it can not be decided by EM only that this should be the actual flow of energy at each point. Feynman, commenting...
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