| Issue |
A&A
Volume 508, Number 2, December III 2009
|
|
|---|---|---|
| Page(s) | 575 - 582 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361/200912575 | |
| Published online | 21 October 2009 | |
Solving the main cosmological puzzles with a generalized time varying vacuum energy
Research Center for Astronomy, Academy of Athens, 11527 Athens, Greece e-mail: svasil@academyofathens.gr
Received:
26
May
2009
Accepted:
12
October
2009
We study the dynamics of the FLRW flat cosmological models
in which the vacuum energy density varies with time, 
.
In particular, we investigate the dynamical
properties of a generalized vacuum model, and we
find that under certain circumstances the vacuum term in the
radiation era varies as 
,
while in the matter era
we have 
up to
and 
for 
.
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 Λ-cosmology) Hubble expansion.
Key words: cosmology: theory / methods: analytical
© ESO, 2009
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