Reconstructing K-essence
Astrophysics
2009-11-13 v2
Abstract
We present a model independent method of reconstructing the Lagrangian for the k-essence field driving the present acceleration of the universe. We consider the simplest k-essence model for which the potential is constant. Later we use three parametrizations for the Hubble parameter , consistent with the recent SN1a data, to yield the Lagrangian . Our reconstruction program does not generate any physically realistic Lagrangian for models that allow phantom crossing, whereas models without phantom crossing, yield well behaved Lagrangian.
Cite
@article{arxiv.astro-ph/0512406,
title = {Reconstructing K-essence},
author = {A. A. Sen},
journal= {arXiv preprint arXiv:astro-ph/0512406},
year = {2009}
}
Comments
Corrections in Figure 2 and 3, new references added, no major change, conclusion remains the same. Accepted in JCAP