The Inflationary Quartic Hilltop Model in a Modified Gravity and Its Comparison with the Observations

2025/07/21 by Younesizadeh, Feyzollah, Kamani, Davoud · 1 citation
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.2507.15812

Abstract

We investigate the inflation for the quartic hilltop model via a certain type of modified gravity. Precisely, we analyze the F(ϕ) T term in the Einstein's gravity to examine the quartic hilltop inflation model. T is the trace of the energy-momentum tensor, and ϕ is the inflaton field. Next, we calculate the inflation dynamics for the foregoing model and obtain the slow-roll parameters, i.e., the scalar spectral index ``n<sub>s</sub>'' and the tensor-to-scale ratio ``r'', which these parameters exhibit high sensitivity to the F(ϕ) T term. This modified form of the gravity is not only in accordance with the predictions of the original model but also allows for better prediction of the Planck/BICEP/Keck data.

Citations

• Modified Gauss-Bonnet theory as gravitational alternative for dark energy
• Models of inflation, supersymmetry breaking and observational constraints
• A new inflationary universe scenario: A possible solution of the horizon, flatness, homogeneity, isotropy and primordial monopole problems

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• The Inflationary Dynamics with the Scalar-Tensor Model

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