First-order formalism and dark energy
arXiv:astro-ph/0512197 · doi:10.1016/j.physletb.2005.12.031
Abstract
This work deals with cosmological models driven by real scalar field, described by standard dynamics in generic spherical, flat, and hyperbolic geometries. We introduce a first-order formalism, which shows how to relate the potential that specifies the scalar field model to Hubble's parameter in a simple and direct manner. Extensions to tachyonic dynamics, and to two or more real scalar fields are also presented.
7 pages, 3 figures