The Bianchi Ix (MIXMASTER) Cosmological Model is Not Integrable
classification
🌀 gr-qc
keywords
exactsolutionbianchiclosedcosmologicalessentialexhibitsform
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The perturbation of an exact solution exhibits a movable transcendental essential singularity, thus proving the nonintegrability. Then, all possible exact particular solutions which may be written in closed form are isolated with the perturbative Painlev\'e test; this proves the inexistence of any vacuum solution other than the three known ones.
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