Flexible dark energy equation of state parametrizations mildly favor dynamical phantom-like behavior at z~1-2, but the preference is only ~2 sigma and sensitive to the model form and extrapolation.
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Probing the sensitivity of dark energy dynamics to equation of state parametrization flexibility
Flexible dark energy equation of state parametrizations mildly favor dynamical phantom-like behavior at z~1-2, but the preference is only ~2 sigma and sensitive to the model form and extrapolation.