Talk detail

Participant	Salucci, Paolo
Institution	SISSA - Via Bonomea 265 - trieste - - Italy

Session	AP1	Accepted		Order	Time
Talk	Oral abstract	Title	The value of the Local Dark Matter density
Co-authors
Abstract	We report the most updated value for the dark matter density at the Sun's location, obtained without globally mass-modeling the Galaxy. The proposed method is independent of i) the shape of the dark matter density profile, ii) knowledge of the rotation curve from the galaxy center out to the virial radius, and iii) the uncertainties and the non-uniqueness of the bulge/disk/dark halo mass decomposition. The result explicitly includes the dependence on the relevant observational quantities and it takes their uncertainties into account. We found: rho_0 = 0.43(11)(10)GeV/cm3. This is the most reliable estimate of rho_0, that, in addition, is ready to take into account for any future change/improvement in the measures of the observational quantities it depends.

Session	PS	Accepted		Order	Time
Talk	Oral abstract	Title	Dark Matter as our ignorance of law of Gravity?
Co-authors
Abstract	If we follow the ruling Dark Matter paradigm in Galaxies, we are forced to accept a number of evidences and relationships that are unexpected and of difficult physical explanation. Among those: the mean "dark matter" surface density within one "dark halo " scale length is constant in galaxies spanning a luminosity range of 14 magnitudes and the whole Hubble sequence. Furthermore, the luminous matter surface density within this same "dark halo" scale is also constant in all galaxies, indicating that they show, at this "dark" radius, a similar gravitational acceleration generated by the luminous component. On the other hand, the structural properties of the "dark" and Luminous mass distributions are also poorly understood yet. Infact, the rotation curves of spirals follow an Universal (URC) curve, in which the luminous and "dark" terms that emerge as strongly correlated in any object and at any radius. This evidence strikes in that it has not easy explanation in the "current" $\Lambda$CDM Cosmology. Then, all this could signal our gross failure in assuming to understand the law of Gravity at a galaxy scale.