2001/11/30 by Lawrence M. Krauss, Brian Chaboyer, Krauss, Lawrence M. +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #Stellar, planetary, and galactic studies #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0111597
19 pages, including 1 table and 3 figures, PDF format, submitted to Nature
arxiv created 2001/11/30 · openalex publication_date 2001/11/30 · arxiv updated 2009/11/30 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28
New estimates of globular cluster distances, combined with revised ranges for\ninput parameters in stellar evolution codes and recent estimates of the\nearliest redshift of cluster formation allow us to derive a new 95% confidence\nlevel lower limit on the age of the Universe of 11 Gyr. This is now\ndefinitively inconsistent with the expansion age for a flat Universe for the\ncurrently allowed range of the Hubble constant unless the cosmic equation of\nstate is dominated by a component that violates the strong energy condition.\nThis solidifies the case for a dark energy-dominated universe, complementing\nsupernova data and direct measurements of the geometry and matter density in\nthe Universe. The best-fit age is consistent with a cosmological\nconstant-dominated (w=pressure/energy density = -1) universe. For the Hubble\nKey project best fit value of the Hubble Constant our age limits yields the\nconstraints w < -0.4 and Omegamatter < 0.38 at the 68 % confidence level, and\nw < -0.26 and Omegamatter < 0.58 at the 95 % confidence level.\n