Bibcode
Cepa, J.
Bibliographical reference
Astronomy and Astrophysics, v.422, p.831-839 (2004)
Advertised on:
8
2004
Journal
Citations
22
Refereed citations
19
Description
The currently available values and confidence limits for
Ωm0, H0 and globular cluster ages still
indicate that the dark energy that dominates the Universe could also be
a form of quintessence or phantom energy. In fact, current cosmological
values favor phantom energy. To increase the likelihood of a
cosmological constant as dark energy instead of phantom energy, the
possibilities seem to lie in reducing globular cluster ages, the Hubble
constant, or both, and possibly advancing the epoch of globular cluster
formation. For a set of possible dark energy equations of state that
includes the cosmological constant, quintessence or phantom energy,
age-redshift analytical expressions for null curvature universes that
include ordinary matter are derived together with the corresponding ages
for these universes. ``Cosmic coincidences'' are found for the currently
accepted values of Ωm0 when evaluating the age of the
Universe with a cosmological constant or a phantom energy as dark
energies.