Viscosity-induced crossing of the phantom divide in the dark cosmic fluid
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In this article, the authors discuss how it is possible for a dark energy fluid to slide from the quintessence region across the divide $w=-1$ into the phantom region, and thus into a Big Rip future singularity.Abstract:
Choosing various natural forms for the equation-of-state parameter $w$ and the bulk viscosity $\zeta$, we discuss how it is possible for a dark energy fluid to slide from the quintessence region across the divide $w=-1$ into the phantom region, and thus into a Big Rip future singularity.read more
Citations
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General bulk-viscous solutions and estimates of bulk viscosity in the cosmic fluid
Ben David Normann,Iver Brevik +1 more
TL;DR: A general formalism for bulk viscous solutions of the energy-conservation equation for ρ ( a, ζ ) , both for a single-component and a multicomponent fluid in the Friedmann universe is derived, and new insight is brought by using estimates of ζ to analyze the fate of the future universe.
Journal ArticleDOI
Characteristic properties of two different viscous cosmology models for the future universe
Ben David Normann,Iver Brevik +1 more
TL;DR: In this article, the authors analyzed characteristic properties of two different cosmological models: (i) a one-component dark energy model where the bulk viscosity ζ is associated with the fluid as a whole, and (ii) a two-component model where ζ was associated with a dark matter component ρm only, the dark energy component considered inviscid.
Journal ArticleDOI
Viscosity-Induced Crossing of the Phantom Barrier
TL;DR: In this article, it was shown that the magnitude of this viscosity may be high enough to drive the fluid from its position in the quintessence region at present time t = 0 across the barrier w = −1 into the phantom region in the late universe.
Journal ArticleDOI
Crossing the phantom divide with dissipative normal matter in the Israel–Stewart formalism
Norman Cruz,Samuel Lepe +1 more
TL;DR: In this paper, a phantom solution in the framework of the causal Israel-Stewart (IS) formalism is discussed and the behavior of the thermodynamic parameters associated to this solution, like the temperature, rate of entropy, entropy, relaxation time, effective pressure and effective EoS are evaluated.
Journal ArticleDOI
Viscosity-Induced Crossing of the Phantom Barrier
TL;DR: It is shown explicitly how the magnitude of this viscosity may be high enough to drive the fluid from its position in the quintessence region at present time t = 0 across the barrier w = −1 into the phantom region in the late universe.
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant To Appear in the Astronomical Journal
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