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Inflation in terms of a viscous van der Waals coupled fluid

Brevik, Iver Håkon; Obukhov, V. V.; Timoshkin, A. V.
Journal article, Peer reviewed
Accepted version
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Brevik (144.3Kb)
Permanent lenke
http://hdl.handle.net/11250/2629015
Utgivelsesdato
2018
Metadata
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  • Institutt for energi og prosessteknikk [2622]
  • Publikasjoner fra CRIStin - NTNU [19694]
Originalversjon
International Journal of Geometric Methods in Modern Physics (IJGMMP). 2018, 15 (9), .   10.1142/S0219887818501505
Sammendrag
We propose to describe the acceleration of the universe by introducing a model of two coupled fluids. We focus on the accelerated expansion at the early stages. The inflationary expansion is described in terms of a van der Waals equation of state for the cosmic fluid, when account is taken of bulk viscosity. We assume that there is a weak interaction between the van der Waals fluid and the second component (matter). The gravitational equations for the energy densities of the two components are solved for a homogeneous and isotropic Friedmann–Robertson–Walker (FRW) universe, and analytic expressions for the Hubble parameter are obtained. The slow-roll parameters, the spectral index, and the tensor-to-scalar ratio are calculated and compared with the most recent astronomical data from the Planck satellite. Given reasonable restriction on the parameters, the agreement with observations is favorable.
Utgiver
World Scientific Publishing
Tidsskrift
International Journal of Geometric Methods in Modern Physics (IJGMMP)

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