Initial conditions for Starobinsky inflation in general quadratic gravity

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Initial conditions for Starobinsky inflation in general quadratic gravity

Authors

Daniel Muller, Alexey Toporensky

Abstract

We consider initial conditions leading to Starobinsky inflation in the general quadratic gravity, where the action of the theory contains one more curvature square invariant in addition to $R^2$. We have chosen corresponding coefficients in a way so that the inflationary solution keeps to be stable. Our numerical results show that despite the configuration of initial conditions in the $(H,R)$ plane, leading to Starobinsky inflation can change considerably from the $R^2$ theory, realization of inflation does not need a fine-tuning of the initial conditions.

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