Hidden Landscape of Inflation: Taxonomy of Localized Features

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Hassan, Rohina | 2025

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 58257 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Abolhassani, Ali Akbar
Abstract:
This study investigates the impact of localized features in inflationary potentials on mode evolution and the primordial power spectrum. Using an abstract framework and analytical and numerical approaches, localized features, such as hyperbolic tangent steps, are modeled to analyze the adiabatic and non-adiabatic transitions induced by these features. The findings reveal that the thickness of localized features plays a crucial role in shaping the intensity and form of anomalies in the power spectrum; thinner features result in more pronounced deviations and faster transitions, while thicker features generate more gradual effects. The proposed approach, by integrating detailed analyses of the dynamics of the inflationary field and modeling localized features, offers a deeper understanding of these phenomena. These results not only expand the boundaries of knowledge in the field of cosmic inflation but also provide tools to bridge observational data with inflationary theories, opening new horizons for analyzing more complex models in modern cosmology
Keywords:
Inflation ; Mode Evolution ; Adiabatic Transitions ; Nonadiabatic Transitions ; Inflationary Potentials ; Localized Features ; Primordial Power Spectrum