Natural Quintessence?
High Energy Physics - Phenomenology
2009-02-20 v2 Astrophysics
General Relativity and Quantum Cosmology
Abstract
We formulate conditions for the naturalness of cosmological quintessence scenarios. The quintessence lagrangian is taken to be the sum of a simple exponential potential and a non-canonical kinetic term. This parameterization covers most variants of quintessence and makes the naturalness conditions particularly transparent. Several ``natural'' scalar models lead, for the present cosmological era, to a large fraction of homogeneous dark energy density and an acceleration of the scale factor as suggested by observation.
Keywords
Cite
@article{arxiv.hep-ph/0008205,
title = {Natural Quintessence?},
author = {A. Hebecker and C. Wetterich},
journal= {arXiv preprint arXiv:hep-ph/0008205},
year = {2009}
}
Comments
11 pages LaTeX, 3 figures included, numerical correction