Quintom model with O($N$) symmetry

Details Quintom model with O($N$) symmetry Quintom model with O($N$) symmetry

2008-08-31

arxiv.org/abs/0809.0114v1

JCAP0809:026,2008

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, no figure

Scientific paper

10.1088/1475-7516/2008/09/026

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.

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