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The limit on $w'$ for tachyon dark energy
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abstract
We get the same degeneracy relation between $w_0$ and $w_a$ for the tachyon fields as for quintessence and phantom fields. Our results show that the dynamics of scalar fields with different origins becomes indistinguishable when the equation of state parameter $w$ does not deviate too far away from -1, and the time variation $w'$ satisfies the same bound for the same class of models. For the tachyon fields, a limit on $w'$ exists due to the Hubble damping and we derived the generic bounds on $w'$ for different classes of models. We may distinguish different models in the phase plane of $w-w'$. The current constraints on $w$ and $w'$ are consistent with all classes of models. We need to improve the constraint on $w'$ by 50% to distinguish different models.
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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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