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We investigate observational constraints from present and future supernova data on a large class of decaying vacuum cosmologies. In such scenarios the present value of the vacuum energy density is quantified by a positive parameter smaller than unity. By assuming a Gaussian prior on the matter density parameter (₌=0. 350. 07) we find ₌=0. 34-₀. ₁₂^+0. 14 and =0. 62-₀. ₂₄^+0. 12 (95% C. L. ) as the best fit values for the present data. We show that, while the current data cannot provide restrictive constraints on the ₌- plane, the future SNe data will limit considerably the allowed parameter space. A brief discussion about the equivalence between dynamical scenarios and scalar field cosmologies is also included.
Alcaniz et al. (Fri,) studied this question.