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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.
MSC:
83D05Relativistic gravitational theories other than Einstein’s
83E30String and superstring theories
83F05Relativistic cosmology
83C15Closed form solutions of equations in general relativity