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Inflation in a viscous fluid model · Around

2015

Inflation in a viscous fluid model

Bamba, Kazuharu, Odintsov, Sergei D.

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We explore a fluid description of the inflationary universe.

In particular, we investigate a fluid model in which the equation of state (EoS) for a fluid includes bulk viscosity.
We find that the three observables of inflationary cosmology: the spectral index of the curvature perturbations, the tensor-to-scalar ratio of the density perturbations, and the running of the spectral index, can be consistent with the recent Planck results.
We also reconstruct the explicit EoS for a fluid from the spectral index of the curvature perturbations compatible with the Planck analysis.

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