The $\kappa$-model under test of the SPARC database

Abstract

Our main goal is here to make a comparative analysis between the well-known MOND theory and a more recent model called$\kappa$-model. An additional connection, between the $\kappa$-model and twoother novel MOND-type theories: Newtonian Fractional-DimensionGravity (NFDG) and Refracted Gravity (RG), is likewise presented.All these models are built to overtake the DM paradigm, or at leastto strongly reduce the dark matter content. Whereas they rely ondifferent formalisms, however, all four seem to suggest that the universal parameter, a0, appearing in MOND theory could intrinsicallybe correlated to either the sole baryonic mean mass density (RG and$\kappa$-model) and/or to the dimension of the object under consideration(NFDG and $\kappa$-model). We could then confer to the parameter a0 amore flexible status of multiscale parameter, as required to explainthe dynamics together in galaxies and in galaxy clusters. Eventually,the conformal gravity theory (CFT) also seems to have some remotelink with the $\kappa$-model, even though the first one is an extension ofgeneral relativity, and the second one is Newtonian in essence. The$\kappa$-model has been tested on a small sample of spiral galaxies and ingalaxy clusters. Now we test this model on a large sample of galaxiesissued from the SPARC database.

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