The claimed exact solution for a generalized Chaplygin gas universe is invalid because it only satisfies the starting equation when the matter constant equals the dark-energy constant, a condition the paper's own fits contradict.
Cosmic Acceleration and Extra Dimensions
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abstract
Brane cosmology presents many interesting possibilities including: phantom acceleration (w<-1), self-acceleration, unification of dark energy with inflation, transient acceleration, loitering cosmology, new singularities at which the Hubble parameter remains finite, cosmic mimicry, etc. The existence of a time-like extra dimension can result in a singularity-free cyclic cosmology.
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An Alternative Approach to the Exact Solution of FRW-Type Spacetime with a Generalized Chaplygin Gas
The claimed exact solution for a generalized Chaplygin gas universe is invalid because it only satisfies the starting equation when the matter constant equals the dark-energy constant, a condition the paper's own fits contradict.