We compare the latest observations of Cosmic Microwave Background ( CMB ) Anisotropies with the theoretical predictions of the standard scenario of structure formation .
Assuming a primordial power spectrum of adiabatic perturbations we found that the total energy density is constrained to be \Omega _ { tot } = 1.03 \pm 0.06 while the energy density in baryon and Cold Dark Matter ( CDM ) are \Omega _ { b } h ^ { 2 } = 0.021 \pm 0.003 and \Omega _ { cdm } h ^ { 2 } = 0.12 \pm 0.02 , ( all at 68 \% C.L . )
respectively .
The primordial spectrum is consistent with scale invariance , ( n _ { s } = 0.97 \pm 0.04 ) and the age of the universe is t _ { 0 } = 14.6 \pm 0.9 Gyrs .
Adding informations from Large Scale Structure and Supernovae , we found a strong evidence for a cosmological constant \Omega _ { \Lambda } = 0.70 _ { -0.05 } ^ { +0.07 } and a value of the Hubble parameter h = 0.69 \pm 0.07 .
Restricting this combined analysis to flat universes , we put constraints on possible ’ extensions ’ of the standard scenario .
A gravity waves contribution to the quadrupole anisotropy is limited to be r \leq 0.42 ( 95 \% c.l . ) .
A constant equation of state for the dark energy component is bound to be w _ { Q } \leq - 0.74 ( 95 \% c.l . ) .
We constrain the effective relativistic degrees of freedom N _ { \nu } \leq 6.2 and the neutrino chemical potential -0.01 \leq \xi _ { e } \leq 0.18 and | \xi _ { \mu, \tau } | \leq 2.3 ( massless neutrinos ) .