• R Chaubey

      Articles written in Pramana – Journal of Physics

    • Bianchi Type-V universe with a viscous fluid and 𝛬-term

      T Singh R Chaubey

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      We have studied the evolution of a homogeneous, anisotropic universe given by a Bianchi Type-V cosmological model filled with viscous fluid, in the presence of cosmological constant 𝛬. The role of viscous fluid and 𝛬-term in the Bianchi Type-V universe has been studied.

    • Bianchi Type-I, V and VIo models in modified generalized scalar–tensor theory

      T Singh R Chaubey

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      In modified generalized scalar–tensor (GST) theory, the cosmological term 𝛬 is a function of the scalar field 𝜙 and its derivatives $\dot{\phi}^{2}$. We obtain exact solutions of the field equations in Bianchi Type-I, V and VIo space–times. The evolution of the scale factor, the scalar field and the cosmological term has been discussed. The Bianchi Type-I model has been discussed in detail. Further, Bianchi Type-V and VIo models can be studied on the lines similar to Bianchi Type-I model.

    • Bianchi Type-I Universe with wet dark fluid

      T Singh R Chaubey

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      The Bianchi Type-I Universe filled with dark energy from a wet dark fluid has been considered. A new equation of state for the dark energy component of the Universe has been used. It is modeled on the equation of state $p = \gamma(\rho − \rho_{*})$ which can describe a liquid, for example water. The exact solutions to the corresponding field equations are obtained in quadrature form. The solution for constant deceleration parameter have been studied in detail for both power-law and exponential forms. The cases $\gamma = 1$ and $\gamma = 0$ have also been analysed.

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