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arXiv · 2006.16074

Exact and slow-roll solutions for exponential power-law inflation connected with f(R) gravity and observational constraints

I. V. Fomin·S. V. Chervon
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Abstract

We investigate an ability of the exponential power-law inflation to be phenomenologically correct model of the early universe. GR scalar cosmology equations we study in Ivanov-Salopek-Bond (or Hamilton-Jacobi like) representation where the Hubble parameter $H$ is the function of a scalar field $\phi$. Such approach admits calculation of the potential for given $H(\phi)$ and consequently reconstruction of $f(R)$ gravity in parametric form. By this manner the Starobinsky potential and non-minimal Higgs potential (and consequently the corresponding $f(R)$ gravity) were reconstructed using constraints on model's parameters. Also comparison to observation (PLANCK 2018) data shows that both models give correct values for scalar spectral index and tensor-to-scalar ratio under wide range of exponential-power-law model's parameters.

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I. V. Fomin, S. V. Chervon. 2020-06-29. Exact and slow-roll solutions for exponential power-law inflation connected with f(R) gravity and observational constraints. https://doi.org/10.3390/universe6110199

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