期刊
PHYSICAL REVIEW D
卷 92, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.124059
关键词
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资金
- MINECO (Spain) [FIS2013-44881, I-LINK 1019]
- Ministry of Education and Science of Russia
- MEXT KAKENHI [15H05890]
- JSPS [23540296]
- Grants-in-Aid for Scientific Research [23540296, 15H05890] Funding Source: KAKEN
- ICREA Funding Source: Custom
The possibility to have singular accelerated evolution in the context of F(R) bimetric gravity is investigated. Particularly, we study two singular models of cosmological evolution, one of which is a singular modified version of the Starobinsky R-2 inflation model. As we demonstrate, for both models in some cases, the slow-roll parameters become singular at the Type IV singularity, a fact that we interpret as a dynamical instability of the theory under study. This dynamical instability may be an indicator of a graceful exit from inflation, and we thoroughly discuss this scenario and the interpretation of the singular slow-roll parameters. Furthermore, it is demonstrated that for some versions of F(R) bigravity, singular inflation is realized in a consistent way so that inflationary indices are compatible with Planck data. Moreover, we study the late-time behavior of the two singular models, and we show that the unified description of early- and late-time acceleration can be achieved in the context of bimetric F(R) gravity.
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