In General Relativity, there is a new field of activity concerning the study
of charged stars. In a recent paper, Ray et al. have shown the possibility that
the collapse of a charged star could form a charged black hole before all the
charge leaves the system. In this field of view we propose a new model for
UHECR and we will show that it is possible to accelerate cosmic rays up to EeV.
In this talk we will compute the UHECR flux, the charged black hole density and
the energy spectrum associated with them in order to reproduce experimental
data. We will see that we need only a small number of these hidden sources in
order to account for observed UHECR properties and we will study the limits on
charge and mass of black holes.Comment: 4 pages, 2 figure
