Viscous Coupled Fluids in Inflationary Cosmology

Abstract

We consider the inflation produced by two coupled fluids in the flat Friedmann-Robertson-Walker universe. Different cosmological models for describing inflation by use of an inhomogeneous equation of state for the fluid are investigated. The gravitational equations for energy and matter are solved, and analytic representations for the Hubble parameter and the energy density are obtained. Corrections in the energy density for matter inducing the inflation and the coupling with energy are discussed. We analyze the description of inflation induced by non-constant equation-of-state parameters from fluid viscosity. The correspondence between the spectral index and the tensor-to-scalar ratio recently observed by the Planck satellite is considered.

7 pages latex, no figures. To appear in JETP

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Cited by in corpus (12)

• Viscous Cosmology for Early- and Late-Time Universe
• Inflationary universe in terms of a van der Waals viscous fluid
• Testing the equation of state for viscous dark energy
• General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the Cosmic Fluid
• Viscous Fluid Holographic Bounce
• Remarks on cosmological bulk viscosity in different epochs
• Inflation in Terms of a Viscous van der Waals Coupled Fluid
• Inflationary Universe with a Viscous Fluid Avoiding Self-Reproduction
• Gravitational Waves in the Presence of Viscosity
• Viscous Accelerating Universe with Non-linear and Logarithmic Equation of State Fluid
• Holographic bounce cosmological models induced by viscous dark fluid from a generalized non-singular entropy function
• Inflating without a flat potential: Viscous inflation