A Severe Challenge to the Modified Newtonian Dynamics Phenomenology in Our Galaxy

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 poses challenges to the standard Lambda 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 approximate to 17-23 kpc) can almost rule out the MOND phenomenology at more than 5 sigma. This strongly supports some of the previous studies claiming that MOND is neither a fundamental theory nor a universal description of galactic properties.

Automated summary

This article analytically derives the rotational curve gradient of the Milky Way in the framework of MOND and provides a rigorous analysis of the MOND phenomenology. The findings show that the recent discovery of the declining rotation curve in the outer region of the Milky Way strongly suggests that MOND is not a fundamental theory nor a universal description of galactic properties.