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Has there been any updates from the astrophysics community about this “gravitational magnetism” explanation[1]? GR/cosmology is not my area of expertise, but if
by nicklecompte 5y ago
Has there been any updates from the astrophysics community about this “gravitational magnetism” explanation[1]? GR/cosmology is not my area of expertise, but if astrophysicists were indeed neglecting the impact of rotating masses on gravitation that seems like a major oversight that needs to be investigated.
[1] A static charge generates an electric field and a moving charge generates a magnetic field. There is a similar effect for gravity: the Einstein equations have a sort of symmetry to the Maxwell equations.
- fpoling 5y agoThe article cited from Wikipedia, https://arxiv.org/abs/1810.04445 https://arxiv.org/abs/1810.04445 , also pointed out that accounting for terms in the metric tensor related to rotation was essential to explain the rotational curves and not using them is simply unsound approximation.
- Sniffnoy 5y agoYes -- the paper is just wrong, lots of other people have also done this calculation and shown that it's off by multiple orders of magnitude. Robin Hanson claims the particular error is the paper's assumption of zero pressure: https://www.overcomingbias.com/2021/03/what-holds-up-a-north-pole-of-dust.html https://www.overcomingbias.com/2021/03/what-holds-up-a-north... Note that what the paper refers to as "gravitomagnetism" is more commonly referred to as "frame-dragging": https://en.wikipedia.org/wiki/Frame-dragging https://en.wikipedia.org/wiki/Frame-dragging