The Dimensionless Age of the Universe: A Riddle for Our Time
Kirshner, Robert P.
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CitationAvelino, Arturo, and Robert P. Kirshner. 2016. “THE DIMENSIONLESS AGE OF THE UNIVERSE: A RIDDLE FOR OUR TIME.” The Astrophysical Journal 828 (1): 35. https://doi.org/10.3847/0004-637x/828/1/35.
AbstractWe present the interesting coincidence of cosmology and astrophysics that points toward a dimensionless age of the Universe H(0)t(0) that is close to one. Despite cosmic deceleration for 9 Gyr and acceleration since then, we find H(0)t(0) = 0.96 +/- 0.01 for the.CDM model that fits SN Ia data from Pan-STARRS, CMB power spectra, and baryon acoustic oscillations. Similarly, astrophysical measures of stellar ages and the Hubble constant derived from redshifts and distances point to H(0)t similar to 1.0 +/- 0.1. The wide range of possible values for H(0)t(0) realized during cosmic evolution means that we live at what appears to be a special time. This "synchronicity problem" is not precisely the same as the usual coincidence problem, because there are combinations of Omega(M) and Omega(Lambda) for which the usual coincidence problem holds but for which H(0)t(0) is not close to 1.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41399814
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