Abstract:
We construct a dark energy model with a phantom scalar field, a standard
scalar field, and a polynomial potential inspired by string field theory. We
find a two-parameter set of exact solutions of the Friedmann equations. We
find a potential satisfying the conditions obtained from the string theory
and such that at large times, some of the exact solutions correspond
to the state parameter $w_{\mathrm{DE}}>-1$ while the others correspond
to $w_{\mathrm{DE}}<-1$. We
demonstrate that the superpotential method is very effective for seeking new
exact solutions.
Keywords:string field theory, cosmology, phantom, dark energy, exact solution, superpotential method.
Fulltext:
PDF file (562 kB)