期刊
PHYSICAL REVIEW D
卷 87, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.083507
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资金
- Perimeter Institute
- NSD Career Grant
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
- European Social Fund (ESF)
- Greek State
We investigate a (super-)renormalizable and ghost-free theory of gravity, showing that under a natural (exponential) ansatz of the form factor and a suitable truncation it can give rise to the Starobinsky inflationary theory in cosmological frameworks, and thus offering a theoretical justification of its origin. We study the corresponding inflationary evolution and we examine the generation of curvature perturbations, adapting the f(R)-like equations in a symmetry-reduced Friedmann-Lemaitre-Robertson-Walker metric. Furthermore, we analyze how the ultraviolet regime of a simply renormalizable and unitary theory of gravity is also compatible with the Starobinsky action, and hence we show that such a theory could account for an inflationary phase of the Universe in the ultraviolet regime. DOI: 10.1103/PhysRevD.87.083507
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