Inverse power law quintessence with nontracking initial conditions
Abstract
A common property of popular models of quintessence dark energy is the convergence to a common solution from a large range of the initial conditions. We reexamine the popular inverse powerlaw model of quintessence (where the common solution is dubbed as the “tracker”) with particular attention to the initial conditions for the field and their influence on the evolution. We find that previously derived limits on the parameters of the potential in this model are valid only in a range of initial conditions. A reasonably sharp boundary lies where the initial energy density of the scalar field is equal to that of the background radiation component. An initial quintessence energy density above this equipartition value leads to a solution that will not have joined the tracker solution by the present epoch. These nontracker solutions possess the property that their present equation of state is very compatible with the observed bounds and independent of the exponent of the potential.
 Publication:

Physical Review D
 Pub Date:
 October 2003
 DOI:
 10.1103/PhysRevD.68.083517
 arXiv:
 arXiv:astroph/0302167
 Bibcode:
 2003PhRvD..68h3517K
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 Astrophysics
 EPrint:
 RevTEX4, 9 figures