Cosmic Inflation with Random Stairlike Potentials and Primordial Black Holes

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Nikbakht, Bahar | 2022

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 55690 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Abolhasani, Ali Akbar; Khosravi, Nima
Abstract:
Primordial black holes have attracted attention because of their possible role in explaining phenomena such as dark matter and gravitational waves. These observations require the primordial black holes to be in different mass ranges. We investigated the inflaton potentials in which the stochastic sequence of sharp step-like features on the slow-roll potential can produce primordial black holes in different mass ranges. To this end, we first studied the cumulative effects of consecutive steps and showed that there is a resonance mechanism that leads to an exponential enhancement of the power spectrum of certain wavelengths.
Keywords:
Primordial Black Holes ; Cosmic Perturbation Theory ; Cosmic Inflation ; Gravitational Waves ; Dark Matter