Analysis of inflationary models in higher-dimensional uniform inflation

2025/01/23 by Takuya Hirose, Hirose, Takuya · 3 citations
Physics and Astronomy · Earth and Planetary Sciences · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.2501.13581

Abstract

We consider higher-dimensional uniform inflation, in which the extra dimensions expand at the same rate as three-dimensional non-compact space during inflation. We compute the cosmological perturbation in D+4 dimensions and derive the spectral index n_s and the tensor-scalar ratio r. We analyze five inflationary models: chaotic inflation, natural inflation, quartic hilltop inflation, inflation with spontaneously broken SUSY, and R² inflation. By combining the results from these models with the Planck 2018 constraints, we discuss that it is not desirable for the extra-dimensional space to expand at the same rate as the three-dimensional non-compact space, except for the case of one extra dimension.

Cited by

• Inflation with a Growing Fifth Dimension
• Extra-natural production of superheavy Kaluza-Klein particles
• Bispectrum from five-dimensional inflation

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