Current and future supernova constraints on decayingΛcosmologies

2002/12/20 by J. S. Alcaniz, J. M. F. Maia, Jackson Max Furtunato Maia · 3 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Energy (signal processing) #Estimator #Geometry #Mathematical physics #Mathematics #Omega #Parameter space #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Statistics #Supernova #astro-ph #gr-qc

paper · pdf · doi:10.1103/physrevd.67.043502

published as Phys.Rev. D67 (2003) 043502 · 6 pages, 4 figures, to appear in Phys. Rev. D

arxiv created 2002/12/20 · openalex publication_date 2003/02/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigate observational constraints from present and future supernova data on a large class of decaying vacuum cosmologies. In such scenarios the present value of the vacuum energy density is quantified by a positive \ensuremathβ parameter smaller than unity. By assuming a Gaussian prior on the matter density parameter (\ensuremathΩ_m=0.35\ifmmode±\else\textpm\fi0.07) we find \ensuremathΩ_m=0.34_\ensuremath-0.12^+0.14 and \ensuremathβ=0.62_\ensuremath-0.24^+0.12 (95% C.L.) as the best fit values for the present data. We show that, while the current data cannot provide restrictive constraints on the \ensuremathΩ_m\ensuremath-\ensuremathβ plane, the future SNe data will limit considerably the allowed parameter space. A brief discussion about the equivalence between dynamical \ensuremathΛ scenarios and scalar field cosmologies is also included.

Citations

• First Estimations of Cosmological Parameters From BOOMERANG
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Prospects for probing the dark energy via supernova distance measurements
• Inflationary cosmology and thermodynamics
• Time-dependent cosmological term
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Thermal Properties of an Inflationary Universe
• Big Bang Nucleosynthesis Predictions for Precision Cosmology
• Evolution of the scale factor with a variable cosmological term
• Deflationary cosmology: Constraints from angular size and ages of globular clusters
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant
• A flat Universe from high-resolution maps of the cosmic microwave background radiation
• Supernovae and the nature of the dark energy
• The Case for a Positive Cosmological Lambda-term

Cited by

• Observational Constraints on Cosmology from the Modified Friedmann Equation
• Cosmological implications and structure formation from a time varying vacuum
• Decaying vacuum energy, matter creation and cosmic acceleration