New Globular Cluster Age Estimates and Constraints on the Cosmic Equation of State and The Matter Density of the Universe

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dc.creatorKrauss, Lawrence M.
dc.creatorChaboyer, Brian
dc.date2001-11-30
dc.date.accessioned2026-07-07T02:01:36Z
dc.date.available2026-07-07T02:01:36Z
dc.descriptionNew estimates of globular cluster distances, combined with revised ranges for input parameters in stellar evolution codes and recent estimates of the earliest redshift of cluster formation allow us to derive a new 95% confidence level lower limit on the age of the Universe of 11 Gyr. This is now definitively inconsistent with the expansion age for a flat Universe for the currently allowed range of the Hubble constant unless the cosmic equation of state is dominated by a component that violates the strong energy condition. This solidifies the case for a dark energy-dominated universe, complementing supernova data and direct measurements of the geometry and matter density in the Universe. The best-fit age is consistent with a cosmological constant-dominated (w=pressure/energy density = -1) universe. For the Hubble Key project best fit value of the Hubble Constant our age limits yields the constraints w < -0.4 and Omega_matter < 0.38 at the 68 % confidence level, and w < -0.26 and Omega_matter < 0.58 at the 95 % confidence level.
dc.description19 pages, including 1 table and 3 figures, PDF format, submitted to Nature
dc.identifierhttps://arxiv.org/abs/astro-ph/0111597
dc.identifierhttp://arxiv.org/abs/astro-ph/0111597
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3806
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNew Globular Cluster Age Estimates and Constraints on the Cosmic Equation of State and The Matter Density of the Universe
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