Replacing the cosmological constant with the Kretschmann scalar yields a dynamical dark energy model that fits supernova and cosmic chronometer data and produces a phantom-crossing equation-of-state parameter w(z) similar to recent phenomenological fits.
Wetterich, Lect
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Dynamical dark energy from Kretschmann scalar at low redshifts
Replacing the cosmological constant with the Kretschmann scalar yields a dynamical dark energy model that fits supernova and cosmic chronometer data and produces a phantom-crossing equation-of-state parameter w(z) similar to recent phenomenological fits.