Recovering the fundamental plane of galaxies by f (R) gravity
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The fundamental plane (FP) of galaxies can be recovered in the framework of f (R) gravity avoiding the issues related to dark matter to fit the observations. In particular, the power-law version f (R) proportional to R-n, resulting from the existence of Noether symmetries for f (R), is sufficient to implement the approach. In fact, relations between the FP parameters and the corrected Newtonian potential, coming from Rn, can be found and justified from a physical point of view. Specifically, we analyze the velocity distribution of elliptical galaxies and obtain that r(c), the scale-length depending on the gravitational system properties, is proportional to re, the galaxy effective radius. This fact points out that the gravitational corrections induced by f (R) can lead photometry and dynamics of the system. Furthermore, the main byproduct of such an approach is that gravity could work in different ways depending on the scales of self-gravitating systems. (C) 2016 Elsevier B.V. All righ...ts reserved.
Keywords:Gravitation / Modified gravity / Galaxies / Fundamental parameters / Galaxies / Luminosity function / Mass function
Source:Physics of the Dark Universe, 2016, 14, 73-83
- Gravitation and the large scale structure of the Universe (RS-176003)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy, iniziative specifiche TEONGRAV and QGSKY, Testing Extended Theories of Gravity at different astrophysical scales [451-03-01231/2015-09/1], COST Actions [MP1304, CA15117], COST (European Cooperation in Science and Technology)