Marco Bruni                                  GGI Florence, October 2006
 Flat model,  UDM with Affine EoS
§Simplest model: k=0, P=Po+ar;               2 parameters, like LCDM with k
§Reach dynamics: 4 cases, 2 standard and 2 phantom, independently of field eqs. (gravity theory).
§Falsifiable, tight constraints
§Admits scalar field version