Abstract
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 while the energy density in baryon and cold dark matter (CDM) are and (all at 68% C.L.), respectively. The primordial spectrum is consistent with scale invariance and the age of the universe is Adding information from large scale structure and supernovae, we found strong evidence for a cosmological constant and a value of the Hubble parameter 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 (95% C.L.). A constant equation of state for the dark energy component is bound to be We constrain the effective relativistic degrees of freedom and the neutrino chemical potential and (massless neutrinos).
- Received 13 October 2002
DOI:https://doi.org/10.1103/PhysRevD.67.081302
©2003 American Physical Society