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w and w' of Scalar Field Models of Dark Energy
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abstract
Important observables to reveal the nature of dark energy are the equation of state $w$ and its time derivative in units of the Hubble time $w'$. Recently, it is shown that the simplest scalar field models of dark energy (quintessence) occupy rather narrow regions in the $w-w'$ plane. We extend the $w-w'$ plane to $w<-1$ and derive bounds on $w'$ as a function of $w$ for tracker phantom dark energy. We also derive bounds on tracker k-essence.
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Cited by 1 Pith paper
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Beyond $j=1$: Observational Constraints on Almost-$\Lambda$CDM Cosmologies
Current BAO+CMB+SN data confine the cosmic jerk to within a few percent of the LambdaCDM value j=1 and yield a reconstructed dark-energy equation of state that remains close to w=-1.
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