K-essence in Horndeski models
General Relativity and Quantum Cosmology
2016-07-20 v2
Abstract
In this paper, we investigate a simple class of Horndeski models where the scalar field plays the role of a k-essence fluid. We present several solutions for early-time universe, namely inflation and cosmological bounce, by making use of some reconstruction technique. Moreover, we furnish the formalism to calculate perturbations in FRW space-time and we compute the spectral index and the tensor-to-scalar ratio during inflation.
Cite
@article{arxiv.1605.02726,
title = {K-essence in Horndeski models},
author = {Shynaray Myrzakul and Ratbay Myrzakulov and Lorenzo Sebastiani},
journal= {arXiv preprint arXiv:1605.02726},
year = {2016}
}
Comments
final version, accepted in Astrophys.Space Sci., 14 pages