Can Old Galaxies at High Redshifts and Baryon Acoustic Oscillations Constrain H_0?

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dc.creatorLima, J. A. S.
dc.creatorJesus, J. F.
dc.creatorCunha, J. V.
dc.date2007-09-14
dc.date2007-09-15
dc.date.accessioned2026-07-07T12:13:45Z
dc.date.available2026-07-07T12:13:45Z
dc.descriptionA new age-redshift test is proposed in order to constrain $H_0$ with basis on the existence of old high redshift galaxies (OHRG). As should be expected, the estimates of $H_0$ based on the OHRG are heavily dependent on the cosmological description. In the flat concordance model ($Λ$CDM), for example, the value of $H_0$ depends on the mass density parameter $Ω_M=1 - Ω_Λ$. Such a degeneracy can be broken trough a joint analysis involving the OHRG and baryon acoustic oscillation (BAO) signature. In the framework of the $ΛCDM$ model our joint analysis yields a value of $H_0=71^{+4}_{-4}\kms$ Mpc$^{-1}$ ($1σ$) with the best fit density parameter $Ω_M=0.27\pm0.03$. Such results are in good agreement with independent studies from the {\it{Hubble Space Telescope}} key project and the recent estimates of WMAP, thereby suggesting that the combination of these two independent phenomena provides an interesting method to constrain the Hubble constant.
dc.description16 pages, 6 figures, 1 table
dc.identifierhttps://arxiv.org/abs/0709.2195
dc.identifierhttp://arxiv.org/abs/0709.2195
dc.identifierAstrophys.J.Lett.690:L85-L88,2009
dc.identifierdoi:10.1088/0004-637X/690/1/L85
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210957
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleCan Old Galaxies at High Redshifts and Baryon Acoustic Oscillations Constrain H_0?
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