• Bijan Modak

      Articles written in Pramana – Journal of Physics

    • A neutrino universe with viscosity

      Bijan Modak

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      A solution of the Einstein field equation corresponding to a distribution of fluid with equation of stateρ = 3p but with a nonvanishing shear viscosity is presented. The solution is spherical symmetric and the flow lines are geodetic.

    • Physical approach to cosmological homogeneity II

      Bijan Modak

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      The question of cosmological homogeneity was earlier studied from the physical point of view, the consideration being limited to the case where the velocity vector is orthogonal to the pressure constant hypersurfaces. The present paper extends the investigation where this condition may not hold true. However the proof of homogeneity requires the introduction of some additional assumptions.

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