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Inflationary universe from higher-derivative quantum gravity
Ratbay Myrzakulov, Sergei Odintsov, Lorenzo Sebastiani
We consider higher-derivative quantum gravity where renormalization group improved effective action beyond one-loop approximation is derived. Using this effective action, the quant…
Early-time cosmic dynamics in and extensions of Born-Infeld gravity
Andrey N. Makarenko, Sergei D. Odintsov, Gonzalo J. Olmo +1
We consider two types of modifications of Born-Infeld gravity in the Palatini formulation and explore their dynamics in the early universe. One of these families considers c…
Inflationary universe from perfect fluid and gravity and its comparison with observational data
Kazuharu Bamba, Shin'ichi Nojiri, Sergei D. Odintsov +1
We investigate the descriptions for the observables of inflationary models, in particular, the spectral index of curvature perturbations, the tensor-to-scalar ratio, and the runnin…
Bounce universe from string-inspired Gauss-Bonnet gravity
Kazuharu Bamba, Andrey N. Makarenko, Alexandr N. Myagky +1
We explore cosmology with a bounce in Gauss-Bonnet gravity where the Gauss-Bonnet invariant couples to a dynamical scalar field. In particular, the potential and and Gauss-Bonnet c…
Quasi-matter domination parameters in bouncing cosmologies
Emili Elizalde, Jaume Haro, Sergei D. Odintsov
For bouncing cosmologies, a fine set of parameters is introduced in order to describe the nearly matter dominated phase, and which play the same role that the usual slow-roll param…
Renormalization-group inflationary scalar electrodynamics and SU(5) scenarios confronted with Planck2013 and BICEP2 results
E. Elizalde, S. D. Odintsov, E. O. Pozdeeva +1
The possibility to construct inflationary models for the renormalization-group improved potentials corresponding to scalar electrodynamics and to and models is inve…