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A model of a cloud formed by massive strings is studied in the context of the usual general relativity. This model is used as a source of Bianchi type I and "Kantowski-Sachs" type of cosmological models. Some global properties of the above-mentioned cosmological models are studied for the equation of state (energy density) (tension density). Particular models that can be explicitly integrated are also studied. The possibility that during the evolution of the Universe the strings disappear leaving only particles is examined.
Patricio S. Letelier (Tue,) studied this question.
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