Marco Bruni                                  GGI Florence, October 2006
Work in progress
§Program: quadratic EoS as a way of parametrizing DE, or even Unified Dark Matter, comparing with observations (Balbi and Quercellini + MB)
§First attempt: affine EoS as UDM and DE+DM, flat models
§Note that an exact a=e=0 model is equivalent to LCDM for r> rL
§Use: age, supernovae, baryon oscillations, CMB peaks.