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Bianchi types II, VIII, and IX string cosmological models with bulk viscosity in a theory of gravitation. (English) Zbl 1242.83098
Summary: We have obtained and presented spatially homogeneous Bianchi types II, VIII, and IX string cosmological models with bulk viscosity in a theory of gravitation proposed by D. K. Sen [Z. Phys. 149, 311–323 (1957; Zbl 0078.19501)] based on Lyra’s geometry [G. Lyra, Math. Z. 54, 52–64 (1951; Zbl 0042.15902)]. It is observed that only vacuum cosmological model exists in case of Bianchi type IX universe. Some physical and geometrical properties of the models are also discussed.
83D05Relativistic gravitational theories other than Einstein’s
83E30String and superstring theories
83F05Relativistic cosmology
83C15Closed form solutions of equations in general relativity