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In a semiclassically quantized two-dimensional cosmological model, it can beshown that the parameter of the equation of state for the accelerating universecan be positive due to the negative energy density and the negative pressure,which is a little different from the conventional wisdom that the parameter isnegative with the positivity of the energy density. Furthermore, we show thatthe full parameter composed of the classical and the quantum-mechanicalcontributions is positive and finite even though the partial state parameterfrom the quantum-mechanical contribution is not positive definite, which meansthat the state parameter is not perturbatively additive in this model.Comment: 9 pages, 4 figures; to appear in the Journal of Korean Physical  Societ

Positive Equation-of-State Parameter in the Accelerating Dilaton Cosmology