Type Ia Supernovae, the Hubble Constant, the Cosmological Constant, and the Age of the Universe
Abstract
The age of the Universe depends on both the present-day Hubble Constant and on the history of cosmic expansion. For decelerating cosmologies such as Omegam= 1, the dimensionless product H0,t0<1 and modestly high values of the Hubble constant H0 > 70 would be inconsistent with a cosmic age t0 larger than 12 Gyr. But if OmegaLambda > 0, then H0,t0 can take on a range of values. Evidence from the Hubble diagram for high redshift Type Ia supernovae favors OmegaLambda~0.7 and H0,t0 ~ 1. Then, if H0 lies in the range 65--73, the age of the Universe, t0, is 14+/-1.6 Gyr.
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