Seminarium Kosmologia i Fizyka Cząstek

Motivated by "Chameleon-gravity" models, we have studied a phenomenological scenario where a scalar field has both a mass and a coupling constant to the ordinary matter which scale with the local properties of the considered astrophysical system. We analyse the feasibility of such scenario calculating the related modified gravitational potential and applying it to galactic and hot gas/stellar dynamics in galaxy clusters and elliptical/spiral galaxies respectively. We will show how the main results of this study demonstrate that this scenario can work fairly well as an alternative to dark matter. In particular,,the combined analysis from elliptical and spiral galaxies, and clusters of galaxies, show evident correlations among theory parameters which suggest the general validity of our results at all scales and a way toward a possible unification of the theory for all types of gravitational systems we considered.