New Holographic Dark Energy Model in Brans-Dicke Theory

• Main Authors: M. Sharif, Syed Asif Ali Shah, Kazuharu Bamba
• Format: Article
• Language: English
• Published: MDPI AG 2018-05-01
• Series: Symmetry
• Subjects: brans-dicke theory; dark energy model; cosmological parameters
• Online Access: http://www.mdpi.com/2073-8994/10/5/153

We study the cosmic evolution of the Bianchi type I universe by using new holographic dark energy model in the context of the Brans-Dicke theory for both non-interacting and interacting cases between dark energy and dark matter. We evaluate the equation of state for dark energy ω D and draw the ω D − ω ˙ D plane, where the dot denotes the time derivative. It is found that a stage in which the cosmic expansion is accelerating can be realized in both cases. In addition, we investigate the stability of the model by analyzing the sound speed. As a result, it is demonstrated that for both cases, the behavior of the sound speed becomes unstable. Furthermore, with the Om-diagnostic tool, it is shown that the quintessence region of the universe can exist.