§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.