Talk detail

Participant	Dwornik, Marek
Institution	University of Szeged - Dugonics square 13. - Szeged - Csongrád megye - Hungary

Session	AT4	Accepted	Yes	Order	8	Time	15'
Talk	Oral abstract	Title	Tests of modified gravity and dark matter models with galactic rotation curves
Co-authors	Zoltán Keresztes, Tibor Harkó and László Á. Gergely
Abstract	We investigated two possible explanations for the dark matter phenomenology observed by studying galactic rotational curves. (i) In the braneworld scenario the effective Einstein equation has extra source terms arising the Weyl curvature of the five-dimensional space-time. This source term behaves as a fluid on the brane (Weyl fluid). We have found a good agreement between the model predictions for the rotational curves and observations when a linear equation of state is hold for the Weyl fluid. (ii) We assumed the cold dark matter is in the form of a Bose-Einstein condensate. We tested this assumption on a selected sample of different type of galaxies. The model solves the cuspy halo problem emerging from N-body simulations. The rotation curves of the high surface brightness and dwarf galaxies can be also explained. However the model shows good agreement with the observations concerning only a subset of low surface brightness galaxies.