Solving the main cosmological puzzles with a generalized time varying vacuum energy

Details Solving the main cosmological puzzles with a generalized time varying vacuum energy Solving the main cosmological puzzles with a generalized time varying vacuum energy

2009-01-21

arxiv.org/abs/0901.3195v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 2 figures, Accepted for publication by Astronomy and Astrophysics

Scientific paper

We study the dynamics of the FLRW flat cosmological models in which the vacuum energy density varies with time, $\Lambda(t)$. In particular, we investigate the dynamical properties of a generalized vacuum model and we find that under certain conditions the vacuum term in the radiation era varies as $\Lambda(z) \propto (1+z)^{4}$, while in the matter era we have $\Lambda(z)\propto (1+z)^{3}$ up to $z\simeq 3$ and $\Lambda(z)=\Lambda$ for $z\le 3$. The confirmation of such a behavior would be of paramount importance because it could provide a solution to the cosmic coincidence problem as well as to the fine tuning problem, without changing the well known (from the concordance $\Lambda$ cosmology) Hubble expansion.

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