= Brian Chaboyer
{c}
{tag=Physicist}
<Brian Chaboyer> coauthored work using ages of old stellar clusters to constrain cosmic history. The analysis combines stellar-evolution calculations, <distance> estimates and uncertainty in when the clusters formed, then compares the resulting age bounds with cosmological expansion models.<New Globular Cluster Age Estimates and Constraints on the Cosmic Equation of State and The Matter Density of the Universe by Lawrence M. Krauss and Brian Chaboyer>[Abstract: cluster ages, distance uncertainties and cosmological constraints]{ref}
The comparison is useful because the universe must be older than its stars. It nevertheless requires the cluster's inferred <stellar age> and the delay before cluster formation to be distinguished.
Back to article page
