Non-Riemannian Volume Elements Dynamically Generate Inflation
arXiv:1912.10412
Abstract
Our primary objective is the formulation of a plausible cosmological inflationary model entirely in terms of a pure modified gravity without any a priori matter couplings within the formalism of non-Riemannian spacetime volume elements. The non-Riemannian volume elements dynamically create in the physical Einstein frame a canonical scalar matter field and produce a non-trivial inflationary scalar potential with a large flat region and a low-lying stable minimum corresponding to the late universe stage. This dynamically generated inflationary potential is a substantial generalization of the classic Starobinsky potential. Our model predicts scalar power spectral index and tensor to scalar ratio in accordance with the available observational data.
14 p., Invited talk at MPHYS10 - 10th Mathematical Physics Meeting, Belgrade, Sept. 2019, to be published in the proceedings, overlap with arXiv:1906.06691