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International Journal of Theoretical Physics

, Volume 57, Issue 5, pp 1410–1416 | Cite as

Large-Scale Corrections to the CMB Anisotropy from Asymptotic de Sitter Mode

  • A. Sojasi
Article

Abstract

In this study, large-scale effects from asymptotic de Sitter mode on the CMB anisotropy are investigated. Besides the slow variation of the Hubble parameter onset of the last stage of inflation, the recent observational constraints from Planck and WMAP on spectral index confirm that the geometry of the universe can not be pure de Sitter in this era. Motivated by these evidences, we use this mode to calculate the power spectrum of the CMB anisotropy on the large scale. It is found that the CMB spectrum is dependent on the index of Hankel function ν which in the de Sitter limit \(\nu \rightarrow \frac {3}{2}\), the power spectrum reduces to the scale invariant result. Also, the result shows that the spectrum of anisotropy is dependent on angular scale and slow-roll parameter and these additional corrections are swept away by a cutoff scale parameter HM < M P .

Keywords

Initial mode Inflation 

Notes

Acknowledgements

This work has been supported by the Islamic Azad University, Rasht Branch, Rasht, Iran.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Physics, Rasht BranchIslamic Azad UniversityRashtIran

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