Look Back Time, the Age of the Universe, and the Case for a Positive Cosmological Constant
| dc.creator | Krisciunas, Kevin | |
| dc.date | 1993-06-07 | |
| dc.date.accessioned | 2026-07-07T02:18:47Z | |
| dc.date.available | 2026-07-07T02:18:47Z | |
| dc.description | We present explicit expressions for the calculation of cosmological look back time, for zero cosmological constant and arbitrary density parameter $Ω$, which, in the limit as redshift becomes infinite, give the age of the universe. The case for non-zero cosmological constant is most easily solved via numerical integration. The most distant objects presently known (approaching redshift z = 5) have implied ages of $\approx$ 1-2 Gyr after the the Big Bang. The range of such age is narrow, in spite of a variety of cosmological models one might choose. We give a graphical representation of a variety of cosmological models and show that a wide range of Hubble constants and values of the age and density of the universe compatible with modern studies are consistent with adoption of a positive cosmological constant. | |
| dc.description | 15 pages, Latex (plus 1 table and 5 graphs obtainable from the author) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9306002 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9306002 | |
| dc.identifier | J.Roy.Astron.Soc.Canada 87 (1993) 223 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/9625 | |
| dc.subject | Astrophysics | |
| dc.title | Look Back Time, the Age of the Universe, and the Case for a Positive Cosmological Constant | |
| dc.type | text |