Constraints on dark energy and quintessence with a comoving standard ruler applied to 2dF quasars

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dc.creatorMamon, Gary A.
dc.creatorRoukema, Boud F.
dc.date2002-12-06
dc.date.accessioned2026-07-07T02:06:46Z
dc.date.available2026-07-07T02:06:46Z
dc.descriptionStructures on very large scales (> 100 Mpc) have negligible peculiar motions, and are thus roughly fixed in comoving space. We looked for significant peaks at very large separation in the two-point correlation function -- corrected for redshift selection effects -- of a well convered subsample of 2378 quasars of the recently released 10k sample of the 2dF quasar survey. Dividing our sample in three redshift intervals, we find a peak at 244/h Mpc, which is perfectly comoving for a restricted set of cosmological parameters, namely Omega_m = 0.25+/-0.15 and Omega_Lambda=0.65+/-0.35 (both at 95% confidence). Assuming a flat Universe, we constrain the quintessence parameter w_Q < -0.35 (95% confidence). We discuss the compatibility of our analysis with possible peaks in the power spectrum.
dc.description4 pages LaTeX2e, 2 figures and style file included. To appear in XVIIIth IAP Colloquium, On the Nature of Dark Energy: observational and theoretical results on the accelerating universe, ed. P. Brax, J. Martin & J. P. Uzan
dc.identifierhttps://arxiv.org/abs/astro-ph/0212169
dc.identifierhttp://arxiv.org/abs/astro-ph/0212169
dc.identifierin 18th IAP Astrophysics Colloquium, On the nature of dark energy (2002), ed. P. Brax, J. Martin & J.-P. Uzan (Paris: Frontier), pp. 229-232
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5475
dc.subjectAstrophysics
dc.titleConstraints on dark energy and quintessence with a comoving standard ruler applied to 2dF quasars
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