Sub-Planckian Scale and Limits for f(R) Models
Abstract
1. Introduction
- ,
- ,
- ,
- ,
- –
- the requirement of model stability, i.e., and ;
- –
- the quick growth of the space size. It must exceed the size of the visible universe, cm; and
- –
- extremely small space expansion at the present time.
2. Basic Equations
3. The Dependence of the Universe Expansion on the Lagrangian Parameters
3.1. R—Gravity
3.2. R2—Gravity
3.3. R3—Gravity
3.4. R4—Gravity
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Petriakova, P.; Popov, A.; Rubin, S. Sub-Planckian Scale and Limits for f(R) Models. Symmetry 2021, 13, 313. https://doi.org/10.3390/sym13020313
Petriakova P, Popov A, Rubin S. Sub-Planckian Scale and Limits for f(R) Models. Symmetry. 2021; 13(2):313. https://doi.org/10.3390/sym13020313
Chicago/Turabian StylePetriakova, Polina, Arkady Popov, and Sergey Rubin. 2021. "Sub-Planckian Scale and Limits for f(R) Models" Symmetry 13, no. 2: 313. https://doi.org/10.3390/sym13020313
APA StylePetriakova, P., Popov, A., & Rubin, S. (2021). Sub-Planckian Scale and Limits for f(R) Models. Symmetry, 13(2), 313. https://doi.org/10.3390/sym13020313