Analytical primordial power spectra from a potential dominated pre-inflationary bounce in a closed universe
Year: 2026
Type: preprint
Abstract: The CMB TT spectrum is suppressed at large scales, a feature that may originate from pre-inflationary dynamics in a closed universe. We study the primordial power spectrum for a potential dominated pre-inflationary bounce in a spatially closed universe by extending the analytical approximations of Thavanesan et al.~\cite{Thavanesan2021}, and find that it exhibits the same suppression trend as the KICI and emergent scenarios. Using the analytical approximation, we further show that the resulting CMB TT spectra for the pre-inflationary bounce scenario are the same as those of the KICI and emergent scenarios, indicating that the pre-inflationary bounce scenario can account for the large scale suppression of the CMB TT spectrum as well as the KICI and emergent scenarios. This extends the potential independent analytical approach to a potential dominated pre-inflationary bounce, providing a new scenario that accounts for the observed large scale suppression of the CMB TT spectrum.
Source: arXiv (Cornell University)
Author: Huang, Qihong
Institution: Zunyi Normal College
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: 自生宇宙模型的相关研究, G510848790
OpenAlex ID: W7160529806