Reconstruction of the deceleration parameter and the equation of state of dark energy

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dc.creatorGong, Yungui
dc.creatorWang, Anzhong
dc.date2006-12-07
dc.date2007-02-13
dc.date.accessioned2026-07-07T11:00:25Z
dc.date.available2026-07-07T11:00:25Z
dc.descriptionThe new 182 gold supernova Ia data, the baryon acoustic oscillation measurement and the shift parameter determined from the Sloan Digital Sky Survey and the three-year Wilkinson Microwave Anisotropy Probe data are combined to reconstruct the dark energy equation of state parameter $w(z)$ and the deceleration parameter $q(z)$. We find that the strongest evidence of acceleration happens around the redshift $z\sim 0.2$ and the stringent constraints on $w(z)$ lie in the redshift range $z\sim 0.2-0.5$. At the sweet spot, $-1.2<w(z)<-0.6$ for the dark energy parametrization $w(z)=w_0+w_a z/(1+z)^2$ at the $3σ$ confidence level. The transition redshift $z_t$ when the Universe underwent the transition from deceleration to acceleration is derived to be $z_t=0.36^{+0.23}_{-0.08}$. The combined data is also applied to find out the geometry of the Universe, and we find that at the $3σ$ confidence level, $|Ω_k|\alt 0.05$ for the simple one parameter dark energy model, and $-0.064<Ω_k<0.028$ for the $Λ$CDM model.
dc.description9 figures, added four contour plots and some discussions on the sweet spot, main conclusion unchanged; v3: references added, PRD in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0612196
dc.identifierhttp://arxiv.org/abs/astro-ph/0612196
dc.identifierPhys.Rev.D75:043520,2007
dc.identifierdoi:10.1103/PhysRevD.75.043520
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187672
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleReconstruction of the deceleration parameter and the equation of state of dark energy
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