Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-26
Astron.Astrophys. 422 (2004) 831-839
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20035734
The currently available values and confidence limits for Omega_m0, H_0 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.
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