Interpretation of galaxy rotation curves from primordial black holes in 4D Einstein-Gauss-Bonnet gravity

Abstract

We develop a novel approach to the dark matter halos in the context of 4 dimensional Einstein-scalar-Gauss-Bonnet gravity. This approach gives a possible interpretation of the problem of the galaxy rotation curves. Moreover, the Gauss-Bonnet coupling describes the interior structure of the galaxies, while there is a presence of a scalar field φ in the galaxy edges. This can provide an interesting interpretation for the functional coupling f (φ). We discuss how this comparison can naturally drive the observed percentages of matter and dark matter in the Universe. The effective mass range in our model is 10 −2 kg − 10 3 kg, which is in good agreement with the constraints on primordial black holes.

Galaxy rotation curves in the f(R, T) gravity formalism

“…It is worthy of mentioning that, recently, in [49] the problem of rotation curves has been discussed in f (R, T) gravity. 4 Finally, one finds some recent attempts in favor of the modified gravity explanation of the Galaxy rotation curves in [50][51][52][53][54][55][56][57].…”