• Anisotropic cosmological models with bulk viscosity and particle creation in Saez–Ballester theory of gravitation

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    • Keywords


      Bianchi type-V model; cosmology; bulk viscosity; particle creation.

    • Abstract


      The paper deals with the study of particle creation and bulk viscosity in the evolution of spatially homogeneous and anisotropic Bianchi type-V cosmological models in the framework of Saez–Ballester theory of gravitation. Particle creation and bulk viscosity are considered as separate irreversible processes. The energy–momentum tensor is modified to accommodate the viscous pressure and creation pressure which is associated with the creation of matter out of gravitational field. A special law of variation of Hubble parameter is applied to obtain exact solutions of field equations in two types of cosmologies, one with power-law expansion and the other with exponential expansion. Cosmological model with power-law expansion has a Big-Bang singularity at time $t = 0$, whereas the model with exponential expansion has no finite singularity. We study bulk viscosity and particle creation in each model in four different cases. The bulk viscosity coefficient is obtained for full causal, Eckart’s and truncated theories. All physical parameters are calculated and thoroughly discussed in both models.

    • Author Affiliations


      Chandel S1 Ram Shri1

      1. Department of Mathematical Sciences, Indian Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
    • Dates

  • Pramana – Journal of Physics | News

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