An exponential correction to Starobinsky's inflationary model

2016/11/15 by Fabris, Júlio C., Miranda, Tays, Piattella, Oliver F.
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.1611.05326

Abstract

We analyse f(R) theories of gravity from a dynamical system perspective, showing how the R² correction in Starobinsky's model plays a crucial role from the viewpoint of the inflationary paradigm. Then, we propose a modification of Starobinsky's model by adding an exponential term in the f(R) Lagrangian. We show how this modification could allow to test the robustness of the model by means of the predictions on the scalar spectral index n_s.

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