2012/11/01 by Peng Wang, Puxun Wu, Hongwei Yu
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #astro-ph.CO #gr-qc
paper · pdf · doi:10.1140/epjc/s10052-012-2245-1
published as Eur. Phys. J. C (2012) 72:2245 · 12 pages, 2 figures, two references added
openalex publication_date 2012/11/01 · arxiv created 2013/02/26 · arxiv updated 2013/02/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Extended quintessence is obtained by coupling a normal scalar field to the Ricci scalar defined in the metric formalism. In this paper, we propose a new extended quintessence dark energy by introducing a non-minimal coupling between the quintessence and gravity, but with the Ricci scalar given from the Palatini formalism rather than the metric one. We find that the equation of state of the new extended quintessence can cross the phantom divide line, and moreover, it oscillates around the -1 line. We also show that the universe driven by the new extended quintessence will enter a dark energy dominated de Sitter phase in the future.