Painlevé singularity analysis of the perfect fluid Bianchi type-IX relativistic cosmological model

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Scientific paper

We perform the Painlevé test (i.e. the Kowalevskaya - Gambier test or the perturbative test) for the perfect fluid Bianchi type-IX relativistic cosmological model, in order to predict some probable chaotic regimes. This technique enables us to detect every single-valued particular solution associated with a given relativistic dynamical system. Several physically interesting cases are studied. These include radiation-dominated and matter-dominated universes, the case of a cosmological constant and the case of the so-called stiff-matter. In all cases but the cosmological constant case, the models studied do not pass the Painlevé test, exhibit infinitely many movable logarithms and are therefore probably chaotic. Moreover, we show that some physically interesting single-valued particular solutions present in the vacuum case cannot subsist for a perfect fluid cosmological model. In particular, in the radiation and dust cases, we show that there cannot exist any exact and closed-form axisymmetric solution.

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