Phantom Instability of Viscous Dark Energy in Anisotropic Space-Time

Phantom dark energy is a proposal that explains the current observations that mildly favor the equation of state of dark energy $ω^{de}$ crossing -1 at 68% confidence level. However, phantom fields are generally ruled out by ultraviolet quantum instabilities. To overcome this discrepancy, in this paper we propose a mechanism to show that how the presence of bulk viscosity in the cosmic fluid can temporarily drive the fluid into the phantom region ($ω<-1$). As time is going on, phantom decays and ultimately $ω^{de}$ approaches to -1. Then we show these quintessence and phantom descriptions of non-viscous and viscous dark energy and reconstruct the potential of these two scalar fields. Also a diagnostic for these models are performed by using the statefinder pairs $\{s,r\}$. All results are obtained in an anisotropic space-time which is a generalization of FLRW universe.

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