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- W2963996894 abstract "In astrophysics and cosmology the matter distribution can be suitably described by a relativistic perfect fluid in equilibrium due to the large scale distribution of galaxies in our universe. However there are several processes like interaction between matter and radiation [1], quarks and gluons [2] and different components of dark matter [3] where such a perfect fluid model is not appropriate. These processes involve dissipation which can be described in terms of a bulk viscous fluid. Further a decay of massive superstring modes into massless modes [4], gravitational string production [5,6] and particle creation effects in the grand unification era [7] are the processes expected to give rise to the viscous effect. Bulk viscosity is another irreversible phenomenon that contributes to entropy production in the Universe. It is believed that dissipative processes in the early stages of the evolution of the Universe may well account for a high degree of isotropy and the ratio of the number of photons to baryons. Another advantage of the introduction of bulk viscosity is that we may get singularity free solutions. Bali and Dave [8] studied the behavior of Bianchi type III string cosmological model both in the presence and the absence of bulk viscous fluid in general relativity. Wang [9] assumed bulk viscosity as a power function of expansion scalar and constructed Kantowski-Sachs bulk viscous string cosmological model. Bali and Pradhan [10], Tripathy et al. [11,12], Rao et al. [13], Kandalkar et al. [14] investigated different cosmological models in the presence of bulk viscosity and cosmic string." @default.
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- W2963996894 date "2016-01-02" @default.
- W2963996894 modified "2023-10-18" @default.
- W2963996894 title "Cosmic Strings and Anisotropic Universe" @default.
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