Cosmic Steps in Modeling Dark Energy
High Energy Physics - Theory
2013-05-29 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
The past and recent data analyses gave some hints of steps in dark energy. Considering the dark energy as a dynamical scalar field, we investigate several models with various steps: a step in the scalar potential, a step in the kinetic term, a step in the energy density and a step in the equation-of-state parameter w. These toy models provide a workable mechanism to generate steps and features of dark energy. Remarkably, a single real scalar can cross w=-1 dynamically with a step in the kinetic term.
Keywords
Cite
@article{arxiv.0908.2477,
title = {Cosmic Steps in Modeling Dark Energy},
author = {Tower Wang},
journal= {arXiv preprint arXiv:0908.2477},
year = {2013}
}
Comments
6 pages, 5 figures, structure improved, reference added, results unchanged