Inflationary universe in fluid description

Abstract

We investigate a fluid description of inflationary cosmology. It is shown that the three observables of the inflationary universe: 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 compatible with the Planck analysis. In addition, we reconstruct the equation of state (EoS) for a fluid from the spectral index of the curvature perturbations consistent with the Planck results. We explicitly demonstrate that the universe can gracefully exit from inflation in the reconstructed fluid models. Furthermore, we explore the singular inflation for a fluid model.

arXiv comment10 pages, no figure, contribution to the 14th Regional Conference on Mathematical Physics, November 9-14, 2015, Quaid-i-Azam University, Islamabad, Pakistan, references added

References in corpus (7)

• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Cosmological Tests of Modified Gravity
• BICEP2 / Keck Array VI: Improved Constraints On Cosmology and Foregrounds When Adding 95 GHz Data From Keck Array
• Modified gravity: walk through accelerating cosmology
• Universe acceleration in modified gravities: $F(R)$ and $F(T)$ cases
• Relativistic Viscous Universe Models
• Bulk viscous quintessential inflation