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

Details Positive Equation-of-state Parameter in the Accelerating Dilaton Cosmology Positive Equation-of-state Parameter in the Accelerating Dilaton Cosmology

2007-03-12

arxiv.org/abs/gr-qc/0703065v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 4 figures; to appear in the Journal of Korean Physical Society

Scientific paper

In a semiclassically quantized two-dimensional cosmological model, it can be shown that the parameter of the equation of state for the accelerating universe can be positive due to the negative energy density and the negative pressure, which is a little different from the conventional wisdom that the parameter is negative with the positivity of the energy density. Furthermore, we show that the full parameter composed of the classical and the quantum-mechanical contributions is positive and finite even though the partial state parameter from the quantum-mechanical contribution is not positive definite, which means that the state parameter is not perturbatively additive in this model.

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