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Email: mphys10@ipb.ac.rs

Abstracts
Emil Nissimov
NonRiemannian volume elements dynamically generate inflation
We propose a simple modified gravity model without any initial matter fields in terms of several alternative nonRiemannian spacetime volume elements within the metric (second order) formalism. We show how the nonRiemannian volume elements, when passing to the physical Einstein frame, create a canonical scalar field and produce dynamically a nontrivial inflationarytype potential for the latter with a large flat region and a stable lowlying 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 $n_s \approx 0.96$ and the tensortoscalar ratio $r \approx 0.002$ for 60 efolds, 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.


Organizers:
Institute of Physics Belgrade (University of Belgrade)
Belgrade, Serbia
Faculty of Mathematics
(University of Belgrade)
Belgrade, Serbia
Mathematical Institute
(Serbian Academy of Sciences and Arts)
Belgrade, Serbia
Faculty of Science
(University of Kragujevac)
Kragujevac, Serbia
Serbian Academy of Sciences and Arts (SASA)
Belgrade, Serbia
Coorganizers:
Institute of Nuclear Sciences "VinÄ¨a"
(University of Belgrade)
Belgrade, Serbia
Institute of Physics
(University of Kragujevac)
Kragujevac, Serbia
Faculty of Physics
(University of Belgrade)
Belgrade, Serbia
Faculty of Sciences
(University of Novi Sad)
Novi Sad, Serbia
School of Electrical Engineering
(University of Belgrade)
Belgrade, Serbia
SEENETMTP
(Southeastern European Network in Mathematical and Theoretical Physics)
Nis, Serbia
