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20-001 Suppression of the long-wavelength CMB spectrum from the Hartle–Hawking wave function in...

최종 수정일: 2020년 5월 14일



 

Suppression of the long-wavelength CMB spectrum from the Hartle–Hawking wave function in the Starobinsky type inflation model

 


Pisin Chen, Hsiao-Heng Yeh, Dong-Han Yeom



Physics of the Dark Universe 27 (2020) 100435


https://doi.org/10.1016/j.dark.2019.100435



Abstract

The lack of correlations on the large scale cosmic microwave background (CMB) anisotropy provides a potential window to probe beyond the standard inflationary scenario. In this paper, we investigate the primordial power spectrum based on the Hartle–Hawking (HH) no-boundary proposal for a homogeneous, isotropic, and spatially-closed universe that leads to Starobinsky-type inflation after the classicalization. While we found that there is no suppression at large scales in the standard R+R^2, we also found that it is possible to sufficiently suppress the large-scale power spectrum if a pre-inflationary stage is introduced to the Starobinsky-type model. In addition, such a pre-inflationary stage will be helpful to explain the preference of large e-foldings of the HH proposal. We calculate the C_{l}^{TT} correlation function and show that our proposal gives a better fit to the Planck CMB data. This suggests that our universe might have begun with a compact HH state with a small positive curvature.

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· Date: August 20(Thu.), 2020 · Place: Online (ZOOM) & Konkuk Univ., Seoul · Website: https://www.apctp.org/plan.php/snail2020-1 · Overview : The origin of the asymmetry between matter and anti-matter