11,396 research outputs found
Action-Angle Variables for Complex Projective Space and Semiclassical Exactness
We construct the action-angle variables of a classical integrable model
defined on complex projective phase space and calculate the quantum mechanical
propagator in the coherent state path integral representation using the
stationary phase approximation. We show that the resulting expression for the
propagator coincides with the exact propagator which was obtained by solving
the time-dependent Schr\"odinger equation.Comment: 11 pages, Revtex 3.0, SNUTP-94-6
Positive Equation-of-state Parameter in the Accelerating Dilaton Cosmology
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.Comment: 9 pages, 4 figures; to appear in the Journal of Korean Physical
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