1998/09/30 by Max Tegmark · 1 citation
Physics and Astronomy · #Age of the universe #Anisotropy #Astrophysics #Baryon acoustic oscillations #Big Bang (financial markets) #Cold dark matter #Cosmic background radiation #Cosmic microwave background #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Galaxy #Hubble's law #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Redshift #Reionization #Supernova #Theoretical physics #astro-ph
paper · pdf · doi:10.1086/311943
published as Astrophys.J.514:L69-L72,1999 · 4 pages, with 3 figs included. Revised to match accepted ApJL version. Links, data and color figs at http://www.sns.ias.edu/~max/9parframes.html or from [email protected]
arxiv created 1999/02/02 · openalex publication_date 1999/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We describe constraints on a "standard" eight-parameter, open cold dark matter (CDM) model from the most recent cosmic microwave background and Type Ia supernova data. Our parameters are the densities of CDM, baryons, vacuum energy and curvature, the reionization optical depth, and the normalization and tilt for both scalar and tensor fluctuations. We find that although the possibility of reionization and of gravity waves substantially weakens the constraints on the CDM and baryon density, the tilt, and the Hubble constant and curvature, allowing, e.g., a closed universe, open models with a vanishing cosmological constant are still strongly disfavored.