2006/08/21 by F. C. Carvalho, J. S. Alcaniz, J. A. S. Lima +1 · 104 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cold dark matter #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Equation of state #Galaxies: Formation, Evolution, Phenomena #Lambda-CDM model #Mathematical physics #Physical cosmology #Physics #Quantum mechanics #Quintessence #Redshift #Scalar (mathematics) #Scalar field #Scalar field dark matter #Theoretical physics #Universe #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevlett.97.081301
published in Physical Review Letters 97(8), 081301 (American Physical Society) · 5 pages, 2 figures. Accepted for publication in Physical Review Letters
arxiv created 2006/08/21 · openalex publication_date 2006/08/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A new cosmological scenario driven by a slow rolling homogeneous scalar field whose exponential potential V(Phi) has a quadratic dependence on the field Phi in addition to the standard linear term is discussed. The derived equation of state for the field predicts a transient accelerating phase, in which the Universe was decelerated in the past, began to accelerate at redshift z approximately 1, is currently accelerated, but, finally, will return to a decelerating phase in the future. This overall dynamic behavior is profoundly different from the standard evolution of the cold dark matter model with a cosmological constant, and may alleviate some conflicts in reconciling the idea of a dark-energy-dominated universe with observables in String or M theory. Some theoretical predictions for the present scalar field plus dark matter dominated stage are confronted with cosmological observations in order to test the viability of the scenario.