Dynamically generated inflation from non-Riemannian volume forms
- Resource Type
- article
- Authors
- D. Benisty; E. I. Guendelman; E. Nissimov; S. Pacheva
- Source
- European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-9 (2019)
- Subject
- Astrophysics
QB460-466
Nuclear and particle physics. Atomic energy. Radioactivity
QC770-798
- Language
- English
- ISSN
- 1434-6044
1434-6052
Abstract We propose a simple modified gravity model without any initial matter fields in terms of several alternative non-Riemannian spacetime volume elements within the metric (second order) formalism. We show how the non-Riemannian volume-elements, when passing to the physical Einstein frame, create a canonical scalar field and produce dynamically a non-trivial inflationary-type potential for the latter with a large flat region and a stable low-lying minimum. We study the evolution of the cosmological solutions from the point of view of theory of dynamical systems. The theory predicts the spectral index $$n_s \approx 0.96$$ ns≈0.96 and the tensor-to-scalar ratio $$r \approx 0.002$$ r≈0.002 for 60 e-folds, which is in accordance with the observational data. In the future Euclid and SPHEREx missions or the BICEP3 experiment are expected to provide experimental evidence to test those predictions.