Age estimates of globular clusters in the Milky Way: Constraints on cosmology

Lawrence M. Krauss, Brian Chaboyer

Research output: Contribution to journalReview articlepeer-review

265 Scopus citations


Recent observations of stellar globular clusters in the Milky Way Galaxy, combined with revised ranges of parameters in stellar evolution codes and new estimates of the earliest epoch of globular cluster formation, result in a 95% confidence level lower limit on the age of the Universe of 11.2 billion years. This age is 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 means that the three fundamental observables in cosmology - the age of the Universe, the distance-redshift relation, and the geometry of the Universe - now independently support the case for a dark energy-dominated Universe.

Original languageEnglish (US)
Pages (from-to)65-69
Number of pages5
Issue number5603
StatePublished - Jan 3 2003

ASJC Scopus subject areas

  • General


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