2024/09/16 by N. Bostan, Rafid H. Dejrah, Bostan, Nilay +1
Physics and Astronomy · Economics, Econometrics and Finance · Earth and Planetary Sciences · #Cosmology and Gravitation Theories #Stochastic processes and financial applications #Geophysics and Gravity Measurements
paper · pdf · doi:10.48550/arxiv.2409.10398
We focus on the inflationary predictions of β-exponential potential models, in which the inflaton is a representation of the field delineating the size of extra-dimension. Since it offers a well-motivated starting point for the study of physics at very high energies, we incorporate an R2 term in the Palatini gravity. In addition, afterward the inflation, the inflaton oscillates about the minimum of the inflation potential, and reheats the universe. This occurs during the reheating phase, at which the inflaton decays into the standard model particles, which fill the universe. We extend our examination by considering the reheating effects on inflationary observables by employing the different scenarios of the reheat temperature. Supposing the standard thermal history after inflation, we display the inflationary predictions, ns, r, dns/dln k of β-exponential potential with minimal coupling in Palatini R2 gravity. Also, different kinds of constraints from a variety of observations, such as BICEP/Keck, Planck 2018, as well as future possible detectable sensitivities that might be reached by CMB experiments: CMB-S4 and LiteBIRD are taken into account in this work. We indicate that our results are consistent with both the latest data and the future sensitivity forecasts of LiteBIRD/Planck and CMB-S4. Finally, the results in this study highlight the viability of our model even in the case of the existence of more stringent constraints expected from future achievable confidence level limits.