Type Ia Supernovae, the Hubble Constant, the Cosmological Constant, and the Age of the Universe

Details Type Ia Supernovae, the Hubble Constant, the Cosmological Constant, and the Age of the Universe Type Ia Supernovae, the Hubble Constant, the Cosmological Constant, and the Age of the Universe

2001-05-23

arxiv.org/abs/astro-ph/0105413v2

Astronomy and Astrophysics

Astrophysics

Proceeding of the Gemini, "Astrophysical Ages and Timescales" conference, 9 pages, 6 figures

Scientific paper

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 Omega_m= 1, the dimensionless product H_0,t_0<1 and modestly high values of the Hubble constant H_0 > 70 would be inconsistent with a cosmic age t_0 larger than 12 Gyr. But if Omega_Lambda > 0, then H_0,t_0 can take on a range of values. Evidence from the Hubble diagram for high redshift Type Ia supernovae favors Omega_Lambda~0.7 and H_0,t_0 ~ 1. Then, if H_0 lies in the range 65--73, the age of the Universe, t_0, is 14+/-1.6 Gyr.

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