Speaker
Description
This work demonstrates a viscous extended holographic Ricci dark energy (EHRDE) in a flat FRW universe based on the Israel-Stewart approach. Under the consideration that EHRDE dominates the universe, we study the evolution equation for the bulk viscous pressure $\Pi$ with the truncated form $\tau \dot{\Pi}+\Pi=-3\xi H$, where $\tau$ is the relaxation time, and $\xi$ is the bulk viscosity coefficient. Considering the thermodynamic pressure of EHRDE and bulk viscous pressure, we demonstrate the evolution of the EoS parameter $w_{DE}$ is behaving like a phantom i.e., $w_{DE}\leq -1$. We also observe that $p_{eff}=p+\Pi$ is a monotone decreasing function of time. A decreasing effect of bulk viscosity happens with the evolution of the universe. Lastly, the generalized second law of thermodynamics is valid for the viscous EHRDE-dominated universe enveloped by an apparent horizon.
| Session | Astroparticle Physics and Cosmology |
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