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Paper   IPM / Astronomy / 14696
School of Astronomy
  Title:   Reconstruction of initial Asymptotic-de Sitter mode in light of the Planck data
  Author(s): 
1.  Hossein. Moshafi
2.  Ata. Sojasi
3.  Ebrahim. yusofi
4.  Majid. Mohsenzadeh
  Status:   Published
  Journal: JCAP
  Year:  2017
  Supported by:            ipm IPM
  Abstract:
The recently released Planck data, emphasize that the background geometry of inflation is not pure de Sitter, but from the slow variation of Hubble parameter during the inflationary era, it can be quasi-de Sitter. This motivates us to consider an asymptotic de Sitter mode function for reconstruction of initial mode and primordial power spectrum of curvature perturbation. Using Markov Chain Monte Carlo (MCMC) method together with applying recent observational constraints from the Cosmic Microwave Background (CMB) data for our parameterized asymptotic initial mode shows some deviation from pure de Sitter or Bunch-Davies mode. Based on Planck 2015 data release the amplitude of scalar perturbations in 68�???0:42 and deviation from Bunch-Davies mode is  0:05 �??? 0:06 . In this parametrization, the CMB power spectrum of our model shows more red-tilt in comparison with CDM model. Furthermore, we found upper limit for tensor-to-scaler ratio with different pivot scales r0:05 < 0:059 and r0:002 < 0:006.

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