2004/02/03 by Yun Wang, Veselin Kostov, Katherine Freese +3 · 26 citations
Physics and Astronomy · #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Degeneracy (biology) #Energy (signal processing) #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Redshift #Supernova #astro-ph #hep-ph
paper · pdf · doi:10.1088/1475-7516/2004/12/003
published in Journal of Cosmology and Astroparticle Physics 2004(12), 003 (Institute of Physics) · submitted to PRD
arxiv created 2004/02/03 · openalex publication_date 2004/12/03 · arxiv updated 2014/10/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The time dependence of the dark energy density can be an important clue to the nature of dark energy in the universe. We show that future supernova data from dedicated telescopes (such as SNAP), when combined with data of nearby supernovae, can be used to determine how the dark energy density ρ X ( z ) depends on redshift, if ρ X ( z ) is not too close to a constant. For quantitative comparison, we have done an extensive study of a number of dark energy models. Based on these models we have simulated data sets in order to show that we can indeed reconstruct the correct sign of the time dependence of the dark energy density, outside of a degeneracy region centred on (where z max is the maximum redshift of the survey; for example, z max = 1.7 for SNAP).