A Time-dependent Cosmological Constant Phenomenology
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We construct a cosmological toy model in which a step-function ``cosmological constant'' is taken into consideration beside ordinary matter. We assume that $Λ$ takes two values depending on the epoch, and matter goes from a radiation dominated era to a dust dominated era. The model is exactly solvable and it can be compared with recent observations.
9 pages, Latex, submitted to Phys. Lett. A
9 pages, Latex, submitted to Phys. Lett. A