Dark group: dark energy and dark matter

We study the possibility that a dark group, a gauge group with particles interacting with the standard model particles only via gravity, is responsible for containing the dark energy and dark matter required by present day observations. We show that it is indeed possible and we determine the constrains for the dark group. The non-perturbative effects generated by a strong gauge coupling constant can de determined and a inverse power law scalar potential IPL for the dark meson fields is generated parameterizing the dark energy. On the other hand it is the massive particles, e.g., dark baryons, of the dark gauge group that give the corresponding dark matter. The mass of the dark particles is of the order of the condensation scale Ac and the temperature is smaller then the photon's temperature. The dark matter is of the warm matter type. The only parameters of the model are the number of particles of the dark group. The allowed values of the different parameters are severely restricted. The dark group energy density at Ac must be Omega(DGc), less than or equal to 0.17 and the evolution and acceptable values of dark matter and dark energy leads to a constrain of Ac and the IPL parameter n giving Ac = 0(1-10(3)) eV and 0.28 less than or equal to n less than or equal to 1.04. (C) 2004 Elsevier B.V. All rights reserved.