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arXiv:0706.1314 (astro-ph)
[Submitted on 10 Jun 2007]

Title:When Did Cosmic Acceleration Start ?

Authors:Alessandro Melchiorri, Luca Pagano, Stefania Pandolfi
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Abstract: A precise determination, and comparison, of the epoch of the onset of cosmic acceleration, at redshift z_acc, and of dark energy domination, at z_eq, provides an interesting measure with which to parameterize dark energy models. By combining several cosmological datasets we place constraints on the redshift and age of cosmological acceleration. For a Lambda-CDM model, we find the constraint z_acc=0.76\pm0.10 at 95% c.l., occurring 6.7\pm0.4 Gyrs ago. Allowing a constant equation of state but different from -1 changes the constraints to z_acc=0.81\pm0.12 (6.9\pm0.5 Gyrs ago) and z_eq=0.48\pm0.14(4.9\pm0.9 Gyrs ago), while dynamical models markedly increase the error on the constraints with z_acc=0.81\pm0.30 (6.8\pm1.4 Gyrs ago) and z_eq=0.44\pm0.20 (4.5\pm1.0 Gyrs ago). Unified dark energy models as Silent Quartessence yield: z_acc=0.80\pm0.16 (6.8\pm0.6 Gyrs ago).
Comments: 5 pages, 2 figures
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0706.1314 [astro-ph]
  (or arXiv:0706.1314v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1314
Journal reference: Phys.Rev.D76:041301,2007
Related DOI: https://doi.org/10.1103/PhysRevD.76.041301

Submission history

From: Alessandro Melchiorri dr. [view email]
[v1] Sun, 10 Jun 2007 13:59:11 UTC (250 KB)
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