1999/11/12 by Osamu Seto, Jun’ichi Yokoyama, Jun'ichi Yokoyama +1 · 36 citations
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Adiabatic process #Amplitude #Classical mechanics #Cosmology and Gravitation Theories #Geometry #Geophysics and Gravity Measurements #Inflation (cosmology) #Inflaton #Mathematical physics #Mathematics #Perturbation (astronomy) #Physics #Quantum electrodynamics #Quantum mechanics #Scalar (mathematics) #Scalar field #Solar and Space Plasma Dynamics #Theoretical physics #astro-ph
paper · pdf · open access · doi:10.1103/physrevd.61.103504
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 61(10) (American Physical Society)
arxiv created 1999/11/12 · openalex publication_date 2000/04/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The spectrum of adiabatic density perturbation generated during inflation is studied in the case the time derivative of an inflation-driving scalar field (inflaton) vanishes at some time during inflation. It is shown that the nondecaying mode of perturbation has a finite value even in this case and that its amplitude is given by the standard formula with the time derivation of the scalar field replaced by the potential gradient using the slow-roll equation.