2016/01/19 by Kazuharu Bamba, Bamba, Kazuharu
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.1601.04773
10 pages, no figure, contribution to the 14th Regional Conference on Mathematical Physics, November 9-14, 2015, Quaid-i-Azam University, Islamabad, Pakistan, references added
openalex publication_date 2016/01/19 · arxiv created 2016/03/01 · arxiv updated 2016/03/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.