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An exponential correction to Starobinsky's inflationary model

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arxiv 1611.05326 v1 pith:IAQ7EPY7 submitted 2016-11-15 gr-qc astro-ph.COhep-th

An exponential correction to Starobinsky's inflationary model

classification gr-qc astro-ph.COhep-th
keywords modelstarobinskycorrectionexponentialinflationarymodificationaddingallow
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We analyse $f(R)$ theories of gravity from a dynamical system perspective, showing how the $R^2$ 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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