New agegraphic dark energy in Horava-Lifshitz cosmology

TL;DR

This paper explores the behavior of new agegraphic dark energy within Horava-Lifshitz gravity, analyzing its evolution, equation-of-state, and compatibility with observations, while noting unresolved theoretical issues.

Contribution

It introduces a detailed analysis of new agegraphic dark energy in Horava-Lifshitz cosmology, including interaction effects and parameter dependencies, expanding understanding of this model.

Findings

Equation-of-state parameter today: w_0 ≈ -0.82

Low-redshift value of w_1 ≈ 0.08

Scenario compatible with current observations

Abstract

We investigate the new agegraphic dark energy scenario in a universe governed by Horava-Lifshitz gravity. We consider both the detailed and non-detailed balanced version of the theory, we impose an arbitrary curvature, and we allow for an interaction between the matter and dark energy sectors. Extracting the differential equation for the evolution of the dark energy density parameter and performing an expansion of the dark energy equation-of-state parameter, we calculate its present and its low-redshift value as functions of the dark energy and curvature density parameters at present, of the Horava-Lifshitz running parameter $\lambda$, of the new agegraphic dark energy parameter $n$, and of the interaction coupling $b$. We find that $w_0=-0.82^{+0.08}_{-0.08}$ and $w_1=0.08^{+0.09}_{-0.07}$. Although this analysis indicates that the scenario can be compatible with observations, it does not enlighten the discussion about the possible conceptual and theoretical problems of Horava-Lifshitz gravity.