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Galactic structures from gravitational radii

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We demonstrate that the existence of a Noether symmetry in f (R) theories of gravity gives rise to an additional gravitational radius, besides the standard Schwarzschild one, determining the dynamics at galactic scales. By this feature, it is possible to explain the baryonic Tully-Fisher relation and the rotation curve of gas-rich galaxies without the dark matter hypothesis. Furthermore, under the same standard, the Fundamental Plane of elliptical galaxies can be addressed.




Capozziello, S., Borka, D., Jovanović, V. B., & Jovanović, P. (2018). Galactic structures from gravitational radii. Galaxies, 6(1).

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