Zitat:
Zitat von Herr Senf
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Das Thema MOND ist nach wie vor umstritten und hängt bei der Untersuchung binärer Systeme offenbar von der Probennahme ab.
Einer der sich damit beschäftigt ist Stacy McGaugh
https://tritonstation.com/2023/05/18...ary-weirdness/
One of the first papers to address this is Hernandez et al (2022). They found a boost in speed that looks like MOND but is not MOND. Rather, it is consistent with the larger speed that is predicted by MOND in the absence of the EFE. This implies that the radial acceleration relation depicted above is absolute, and somehow more fundamental than MOND. This would require a new theory that is very similar to MOND but lacks the EFE, which seems necessary in other situations. Weird.
A thorough study has independently been made by Pittordis & Sutherland (2023). I heard a talk by them over Zoom that motivated the previous post to set the stage for this one. They identify a huge sample of over 73,000 wide binaries within 300 pc of the sun. Contrary to Hernandez et al., they find no boost at all. The motions of binaries appear to remain perfectly Keplerian. There is no hint of MOND-like effects. Different.
MOND hat diverse Probleme, e.g. bullet cluster, CMB (in welche Potential Delle fällt die baryonische Materie?) ... . Außerdem ist MOND nicht übermäßig ästhetisch.
