2005/10/20 by Takeshi Chiba · 4 citations
Economics, Econometrics and Finance · Mathematics · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Algorithm #Astrophysics #Computer science #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Energy (signal processing) #Equation of state #Field (mathematics) #Geometry #Mathematical physics #Mathematics #Observable #Particle physics #Physics #Plane (geometry) #Quantum mechanics #Quintessence #Scalar (mathematics) #Scalar field #Stochastic processes and financial applications #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.73.063501
published as Phys.Rev.D73:063501,2006; Erratum-ibid.D80:129901,2009 · 7 pages, 2 figures, errors corrected
openalex publication_date 2005/10/20 · arxiv created 2009/11/06 · arxiv updated 2014/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Important observables to reveal the nature of dark energy are the equation of state w and its time derivative in units of the Hubble time w'. Recently, it is shown that the simplest scalar field models of dark energy (quintessence) occupy rather narrow regions in the w-w' plane. We extend the w-w' plane to w<-1 and derive bounds on w' as a function of w for phantom dark energy. We also derive bounds on k-essence. The observational window for w' for w<-1 is not narrow, \σ(w') siml 6|1+w|.