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We investigate observational constraints from lensing statistics and high-z type Ia supernovae on flat cosmological models with nonrelativistic matter and an exotic fluid with an equation of state, pₗ= (m/3-1) ₗ. We show that agreement with both tests at the 68% confidence level is possible if the parameter m is low (m0. 85) and 0. 24₌₀0. 38 with lower values of ₌₀ corresponding to higher m. We find that a conventional cosmological constant model with ₌₀0. 33 is the best fit model of the combined likelihood.
Waga et al. (Thu,) studied this question.