Year: 2016
Type: article
Abstract: Inflation in the framework of f ( R ) modified gravity is revisited. We study the conditions that f ( R ) should satisfy in order to lead to a viable inflationary model in the original form and in the Einstein frame. Based on these criteria we propose a new logarithmic model as a potential candidate for f ( R ) theories aiming to describe inflation consistent with observations from Planck satellite (2015). The model predicts scalar spectral index 0.9615 < n s < 0.9693 in agreement with observation and tensor-to-scalar ratio r of order 10 −3 . Furthermore, we show that for a class of models, a natural coupling between inflation and a scalar boson is generated through the minimal coupling between gravity and matter fields and a reheating temperature less that 10 9 GeV is obtained.
Authors: M. Amin, S. Khalil, M. Salah
Institutions: Zewail City of Science and Technology, Cairo University
Language: Hebrew
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,290
Awards: G5818844628, G5924466989, G6327668299
OpenAlex ID: W2203989033