https://doi.org/10.1140/epjc/s10052-023-11454-6
Regular Article - Theoretical Physics
On the emergence of a classical isotropic universe from a quantum f(R) Bianchi cosmology in the Jordan frame
1
School of Mathematics and Statistics (SoMaS), University of Sheffield, Hounsfield Road, S3 7RH, Sheffield, UK
2
ENEA, Fusion and Nuclear Safety Department, C.R. Frascati, Via E. Fermi 45, 00044, Frascati, RM, Italy
3
Physics Department (VEF), Sapienza University of Rome, P.le A. Moro 5, 00185, Roma, Italy
Received:
25
August
2022
Accepted:
2
April
2023
Published online:
11
April
2023
We demonstrate a spontaneous tendency of quantum wave packets to become quasi-classical, providing a classical limit for the Universe dynamics. However, this limit is not maintained in the future (after a critical value of the relational time) and a spreading process is turned on. We show that the onset of an inflationary scenario is not able to make this localization stable of the wave packets for the Bianchi I model. Instead, when we implement a perturbative inflationary scenario for the isotropic Universe a mechanism of stable classicalization of the Universe emerges. This result outlines a sharp difference between the standard relativistic cosmology and a modified f(R) paradigm.
© The Author(s) 2023
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