Constraint on the cosmic age from the solar r-process abundances
Abstract
The cosmic age is an important physical quantity in cosmology. Based on the radiometric method, a reliable lower limit of the cosmic age is derived to be 15.68 1.95 Gyr by using the r-process abundances inferred for the solar system and observations in metal-poor stars. This value is larger than the latest cosmic age 13.813 0.058 Gyr from Planck 2013 results, while they still agree with each other within the uncertainties. The uncertainty of 1.95 Gyr mainly originates from the error on thorium abundance observed in metal-poor star CS 22892-052, so future high-precision abundance observations on CS 22892-052 are needed to understand this age deviation.
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