Flat universe with decaying cosmological constant
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We have investigated the Robertson-Walker cosmological model with decaying vacuum density. We considered a special variation law in which the vacuum density Λ is proportional to the n-th power of the Hubble parameter H, i.e., Λ ∝ H n (where n is a constant) (Phys. Rev. D 58, 043506 (1998)). Physical, kinematical and statefinder parameters are evaluated and their behaviors are discussed. It can be seen that the values of statefinders resemble the ΛCDM model and, so, the model is in agreement with recent observations.