2008/08/31 by M. R. Setare, Emmanuel N. Saridakis, E. N. Saridakis · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #hep-th
paper · pdf · doi:10.1088/1475-7516/2008/09/026
published as JCAP0809:026,2008 · 13 pages, no figure
arxiv created 2008/08/31 · openalex publication_date 2008/09/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We investigate the quintom model of dark energy in the generalized case where the corresponding canonical and phantom fields possess O( N ) symmetries. Assuming exponential potentials we find that this O( N ) quintom paradigm exhibits novel properties comparing to the simple canonical and phantom scenarios. In particular, we find that the universe cannot result in a quintessence-type solution with w >−1, even in the cases where the phantom field seems to be irrelevant. On the contrary, there are always late-time attractors which correspond to accelerating universes with w <−1 and with a recent crossing of the phantom divide, and for a very large area of the parameter space they are the only ones. This is in contrast with the previous simple quintom results, where an accelerating universe is a possible late-time stable solution but it is not guaranteed.