Searching for a Solution to the Age Problem of the Universe

Details Searching for a Solution to the Age Problem of the Universe Searching for a Solution to the Age Problem of the Universe

2004-11-10

arxiv.org/abs/astro-ph/0411257v2

Grav.Cosmol.13:46-50,2007

Astronomy and Astrophysics

Astrophysics

5 LaTex pages, considerable changes in the text and also addition of new references. Accepted for publication in Gravitation a

Scientific paper

We present here a phenomenological cosmological model under perfect fluid distribution with a stiff equation of state $p=\rho$. The erstwhile cosmological constant is assumed to be a time dependent variable, i.e., $\Lambda = \Lambda(t)$ in our study. It has been shown that the estimates of different cosmological parameters from this model are in good agreement with the experimental results, especially 13.79 Gyr as the age of the universe is quite satisfactory. The behavior and relation of $\Lambda$-stiff fluid model with dust, viscous fluid and variable $G$ have also been investigated in detail.

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