Time variable cosmological constant of holographic origin with interaction in Brans-Dicke theory

TL;DR

This paper explores a holographic, time-varying cosmological constant within Brans-Dicke theory, demonstrating an accelerating universe with dark energy EOS crossing the phantom divide, and uses jerk parameter for model distinction.

Contribution

It introduces a novel model of TVCC with interaction in Brans-Dicke theory and analyzes its cosmological implications and distinguishability from the cosmological constant.

Findings

Universe can accelerate under this model

Dark energy EOS crosses phantom divide

Jerk parameter distinguishes the model

Abstract

Time variable cosmological constant (TVCC) of holographic origin with interaction in Brans-Dicke theory is discussed in this paper. We investigate some characters for this model, and show the evolutions of deceleration parameter and equation of state (EOS) for dark energy. It is shown that in this scenario an accelerating universe can be obtained and the evolution of EOS for dark energy can cross over the boundary of phantom divide. In addition, a geometrical diagnostic method, jerk parameter is applied to this model to distinguish it with cosmological constant.