The state of the dark energy equation of state

2002/11/30 by A. Melchiorri, Alessandro Melchiorri, Laura Mersini–Houghton +4 · 16 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #CMB cold spot #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Equation of state #Galaxy #Hubble's law #Limit (mathematics) #Luminosity #Mathematical analysis #Mathematical physics #Observational cosmology #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Supernova #astro-ph #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.68.043509

published as Phys.Rev.D68:043509,2003 · 7 pages, 4 figures, added a reference

arxiv created 2003/04/16 · openalex publication_date 2003/08/12 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

By combining data from seven cosmic microwave background experiments (including the latest WMAP results) with the Hubble parameter measurement from the Hubble space telescope and luminosity measurements of type Ia supernovae, we demonstrate the bounds on the dark energy equation of state w_Q to be \ensuremath-1.45<w_Q<\ensuremath-0.74 at the 95% confidence level. Although our limit on w_Q is improved with respect to previous analyses, cosmological data do not rule out the possibility that the equation of state parameter w_Q of the dark energy Q is less than \ensuremath-1. We present a tracking model that ensures w_Q<~\ensuremath-1 at recent times and discuss the observational consequences.

Citations

• Constraints on Cosmological Models from [ITAL]Hubble Space Telescope[/ITAL] Observations of High-[CLC][ITAL]z[/ITAL][/CLC] Supernovae
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Observation of Cosmic Acceleration and Determining the Fate of the Universe
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Current constraints on the dark energy equation of state
• Relic dark energy from the trans-Planckian regime
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant
• Cosmological consequences of a rolling homogeneous scalar field
• Kinetically driven quintessence
• The power spectrum of galaxies in the 2dF 100k redshift survey
• k-Inflation

Cited by

• VISCOUS GENERALIZED CHAPLYGIN GAS
• Hubble expansion and structure formation in time varying vacuum models
• Hawking radiation and thermodynamics of dynamical black holes in a phantom-dominated universe
• The case for dynamical dark energy revisited
• Bouncing universe with the modified gravity coupled to the Weyl tensor
• Entanglement production in Einstein-Cartan theory
• Phantom cosmologies
• Crossing the phantom barrier with purely kinetic multiple k-essence
• Unified phantom cosmology: Inflation, dark energy and dark matter under the same standard
• Smooth Crossing of wΛ = −1 Line in a Single Scalar Field Model
• Cosmological constraints on the dark energy equation of state and its evolution
• A COMPARISON OF QUINTESSENCE AND NON-LINEAR BORN–INFELD SCALAR FIELD USING GOLD SUPERNOVA DATA
• Nonlinear electrodynamics and the acceleration of the Universe
• RECONSTRUCTING THE POTENTIALS FOR THE QUINTESSENCE AND TACHYON DARK ENERGY, FROM THE HOLOGRAPHIC PRINCIPLE
• Probing the evolution of the dark energy density with future supernova surveys
• Black Holes in Bulk Viscous Cosmology
• Cosmological implications and structure formation from a time varying vacuum