Talk detail

Participant	Argüelles, Carlos Raúl
Institution	International Center for Relativistic Astrophysics Network, University of Rome 'La Sapienza' - Ple. Aldo Moro 5 - Rome - Rome - Italy

Session	EG4	Accepted	Yes	Order	14	Time	17:50 - 18:05
Talk	Oral abstract	Title	On Einstein Clusters and Dark Matter
Co-authors	Andrea Geralico, Remo Ruffini
Abstract	The clasification of Einstein Clusters based on the analysis of the stability of circular orbits according to the effective potential theory is compared with that resulting from the application of the maximum binding energy criterion. The stability properties are investigated for different choices of the energy density profile. The application of the model to the case of our Galaxy is also studied, showing that a dark Einstein Cluster (i.e. composed by dark matter) with constant energy density is an alternative for a central massive Black Hole. An analysis of the composition and lifetime of a dark Einstein cluster is also made.

Session	EG4	Accepted	Yes	Order	16	Time	18:20 - 18:35
Talk	Oral abstract	Title	Semi-degenerate self-gravitating system of fermions as Dark Matter in Galaxies II: Core & Halo description
Co-authors	Bernardo Fraga, Remo Ruffini, Ivan Siutsou
Abstract	We use a model of self-gravitating fermions at finite temperature in General Relativity to describe dark matter (DM) in galaxies. We explore the maximum possible range of the free parameter space of the model, when compared with observations of central dark objects and galactic halos. In particular, we show that for very high values of the degeneracy parameter, central objects in galaxies with masses up to the Oppenheimer-Volkoff critical mass can be formed. Nontheless, for these cases no halo is present. Instead, when considering low values of this parameter we can hace a condensed central object and a halo in agreement with observations. For the Milky Way case, we found a central cored density distribution within a radius of 10^-2 pc for the right observed central mass.