2017/02/28 by Hossein Moshafi, A. Sojasi, Moshafi, Hossein +5
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.1702.08790
openalex publication_date 2017/02/28 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
The recently relased \Planck data, emphasize that the background\ngeometry of inflation is not pure de Sitter, but from the slow variation of\nHubble parameter during the inflationary era, it can be quasi-de Sitter. This\nmotivates us to consider an asymptotic de Sitter mode function for\nreconstruction of initial mode and primordial power spectrum of curvature\nperturbation. Using Markov Chain Monte Carlo (MCMC) method together with\napplying recent observational constraints from the Cosmic Microwave Background\n(CMB) data for our parametrized asymptotic initial mode shows some deviation\nfrom pure de Sitter or Bunch-Davies mode. Based on \Planck 2015 data\nrelease the amplitude of scalar perturbations in 68 % confidence level is\n109 As =2.77+0.32-0.35 and deviation from Bunch-Davies mode is\n\∼ 0.03-0.04. In this parametrization, the CMB power spectrum of our model\nshows more red-tilt in comparison with \Λ rmCDM model. Furthermore,\nwe found upper limit for tensor-to-scalar ratio with different pivot scales\nr0.05< 0.0272 and r0.002< 0.0242.\n