Hybrid dark energy

Abstract

Extending previous results [Phys. Rev. Lett. 97, 081301 (2006)], we explore the cosmological implications of a new quintessence scenario driven by a slow rolling homogeneous scalar field whose equation of state behaved as freezing over the entire cosmic evolution, is approaching -1 today, but will become thawing in the near future, thereby driving the Universe to an eternal deceleration. We argue that such a mixed behavior, named \emph{hybrid}, may reconcile the slight preference of current observational data for freezing potentials with the impossibility of defining observables in the String/M-theory context due to the existence of a cosmological event horizon in asymptotically de Sitter universes as, e.g., pure freezing scenarios.

4 pages, 4 figures, LaTeX

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Cited by in corpus (10)

• Cosmological Evolution With Interaction Between Dark Energy And Dark Matter
• A generalized equation of state for dark energy
• Current constraints on the epoch of cosmic acceleration
• Cosmological consequences of a possible $\Lambda$-dark matter interaction
• Constraints on dark energy models from radial baryon acoustic scale measurements
• Cosmological Consequences of Exponential Gravity in Palatini Formalism
• Expanding Universe: slowdown or speedup?
• Coupled quintessence with a possible transient accelerating phase
• Constraining thawing and freezing models with cluster number counts
• A class of transient acceleration models consistent with Big Bang Cosmology