2004/02/04 by J. A. S. Lima · 12 citations
Computer Science · Physics and Astronomy · #Component (thermodynamics) #Computational Physics and Python Applications #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Flatness (cosmology) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Redshift #astro-ph #gr-qc
paper · pdf · doi:10.1590/s0103-97332004000200009
published as Braz.J.Phys.34:194-200,2004 · 11 pages, 4 figures, Invited talk at XXIII Brazilian National Meeting on Particles and Fields, Aguas de Lindoia, Sao Paulo, Brazil. To appear in Brazilian Journal of Physics (2004)
arxiv created 2004/02/04 · openalex publication_date 2004/03/01 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A large number of recent observational data strongly suggest that we live in a flat, accelerating Universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named Dark Energy or Quintessence. The basic set of experiments includes: observations from SNe Ia, CMB anisotropies, large scale structure, X-ray data from galaxy clusters, age estimates of globular clusters and old high redshift galaxies (OHRG's). It is now widely believed that such results provide the remaining piece of information connecting the inflationary flatness prediction (W T = 1) with astronomical observations. From a theoretical viewpoint, they have also stimulated the current interest for more general models containing an extra component describing this unknown dark energy, and simultaneously accounting for the present accelerating stage of the Universe. In this review we present a simplified picture of the main results and discuss briefly some difficulties underlying the emerging dark energy paradigm.