arXiv:2309.05252 (astro-ph) [Submitted on 11 Sep 2023] A severe challenge to the MOND phenomenology in our Galaxy Man Ho Chan, Ka Chung Law Download PDF
Modified Newtonian Dynamics (MOND) is one of the most popular alternative theories of dark matter to explain the missing mass problem in galaxies. Although it remains controversial regarding MOND as a fundamental theory, MOND phenomenology has been shown to widely apply in different galaxies, which gives challenges to the standard Λ cold dark matter model. In this article, we derive analytically the galactic rotation curve gradient in the MOND framework and present a rigorous analysis to examine the MOND phenomenology in our Galaxy. By assuming a benchmark baryonic disk density profile and two popular families of MOND interpolating functions, we show for the first time that the recent discovery of the declining Galactic rotation curve in the outer region (R≈17−23 kpc) can almost rule out the MOND phenomenology at more than 5σ. This strongly supports some of the previous studies claiming that MOND is neither a fundamental theory nor a universal description of galactic properties.
Comments: Accepted in ApJ Subjects: Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:2309.05252 [astro-ph.GA]
3 comments:
arXiv:2309.05252 (astro-ph)
[Submitted on 11 Sep 2023]
A severe challenge to the MOND phenomenology in our Galaxy
Man Ho Chan, Ka Chung Law
Download PDF
Modified Newtonian Dynamics (MOND) is one of the most popular alternative theories of dark matter to explain the missing mass problem in galaxies. Although it remains controversial regarding MOND as a fundamental theory, MOND phenomenology has been shown to widely apply in different galaxies, which gives challenges to the standard Λ cold dark matter model. In this article, we derive analytically the galactic rotation curve gradient in the MOND framework and present a rigorous analysis to examine the MOND phenomenology in our Galaxy. By assuming a benchmark baryonic disk density profile and two popular families of MOND interpolating functions, we show for the first time that the recent discovery of the declining Galactic rotation curve in the outer region (R≈17−23 kpc) can almost rule out the MOND phenomenology at more than 5σ. This strongly supports some of the previous studies claiming that MOND is neither a fundamental theory nor a universal description of galactic properties.
Comments: Accepted in ApJ
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2309.05252 [astro-ph.GA]
Discussed here https://tritonstation.com/2023/09/08/is-the-milky-ways-rotation-curve-declining/
I'm busy defending widows and orphans in court again for a couple of days and won't be active online.
okay I was just about to ask about Deur and A severe challenge to the MOND phenomenology in our Galaxy
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