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29 March 2024
 
  » arxiv » astro-ph/0212169

 Article overview


Constraints on dark energy and quintessence with a comoving standard ruler applied to 2dF quasars
Gary A. Mamon ; Boud F. Roukema ;
Date 6 Dec 2002
Journal in 18th IAP Astrophysics Colloquium, On the nature of dark energy (2002), ed. P. Brax, J. Martin & J.-P. Uzan (Paris: Frontier), pp. 229-232
Subject astro-ph
Affiliation1,2), Boud F. Roukema ( IAP, Paris, France GEPI, Obs. de Paris, Torun Ctr for Cosmology, Univ. N. Copernicus, Torun, Poland
AbstractStructures 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.
Source arXiv, astro-ph/0212169
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