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- Title
Departure to pure de Sitter geometry based on Planck data.
- Authors
Suratgar, K.; Mohsenzadeh, M.; Yusofi, E.; Tagizadeh-Farahmand, F.
- Abstract
In this paper, we will obtain the basic parameters of primordial inflation such as power spectrum, scalar spectral index, and tensor-to-scalar ratio as a function of Hankel index ν for asymptotic-de Sitter inflation and then, based on the observational constraints on these parameters from Planck data, we obtain the allowable range for index ν. We will show that only the non-phantom phase is acceptable for quasi-de Sitter inflation at early universe. As a significant result, both of the primordial and late accelerating expansion are always in a quasi-vacuum phase (with w ≈ − 1) and it has never been in a pure-vacuum phase (with w = − 1), i.e. cosmological constant. Therefore, based on our recent finding [E. Yusofi, M. Khanpour, B. Khanpour, M. A. Ramzanpour and M. Mohsenzadeh, Surface tension of cosmic voids as a possible source for dark energy, Mon. Not. R. Astron. Soc. 511 (2022) L82], we offer the surface tension of cosmic voids as a suitable alternative to the cosmological constant Λ , for accelerating universe.
- Subjects
EXPANDING universe; COSMOLOGICAL constant; DARK energy; INFLATIONARY universe; SURFACE tension; HANKEL functions
- Publication
International Journal of Geometric Methods in Modern Physics, 2022, Vol 19, Issue 9, p1
- ISSN
0219-8878
- Publication type
Article
- DOI
10.1142/S0219887822501419