2004
DOI: 10.1088/1475-7516/2004/06/008
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The case for dynamical dark energy revisited

Abstract: Abstract. We investigate the behaviour of dark energy using the recently released supernova data of Riess et al., 2004 and a model independent parameterization for dark energy (DE). We find that, if no priors are imposed on Ω 0m and h, DE which evolves with time provides a better fit to the SNe data than ΛCDM. This is also true if we include results from the WMAP CMB data. From a joint analysis of SNe+CMB, the best-fit DE model has w 0 < ∼ − 1 at the present epoch and the transition from deceleration to accele… Show more

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Cited by 417 publications
(413 citation statements)
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“…For c < 1, we adopt the constrained value c = 0.815 from the observational data (Alam et al 2004). In this case (reddashed line) the phantom regime can be crossed in the near past in agreement with observations (Alam et al 2004;Gong 2005;Gong & Zhang 2005;Huterer & Cooray 2005;Wang & Tegmark 2005).…”
Section: Cosmology With Holographic Dark Energysupporting
confidence: 71%
“…For c < 1, we adopt the constrained value c = 0.815 from the observational data (Alam et al 2004). In this case (reddashed line) the phantom regime can be crossed in the near past in agreement with observations (Alam et al 2004;Gong 2005;Gong & Zhang 2005;Huterer & Cooray 2005;Wang & Tegmark 2005).…”
Section: Cosmology With Holographic Dark Energysupporting
confidence: 71%
“…One of the most interesting aspects of these discussions is the possibility to have a slowly varying DE density of the Universe [16]. This option cannot be ruled out by the analysis of the present data [17,18]. In case that the new generation of cosmic observational experiments will indeed detect a variable DE, the natural question to ask is: would this fact really mean the manifestation of a qualitatively new physical reality such as quintessence [19], Chaplygin gas [20], extra dimensions [21] or of low-energy quantum gravity [22,23,24,25]?…”
Section: Introductionmentioning
confidence: 73%
“…In the analysis of dark energy the main attraction should be on the state parameter w = p ρ where p and ρ are the pressure and energy density of the dark energy. In Cosmological constant model w = −1 around present epoch [8] from w > −1 in the near past [9]. There are various kinds of models of dark energy and among all of them, the simplest case is the ΛCDM model which has ρ = Λ = constant and the equation of state as p = −ρ.…”
Section: Pacs Numbersmentioning
confidence: 99%