Warm Inflation Model in Effective Field Theory of Axion Monodromy

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Ghomi Shurkai, Reza | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52830 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Abolhassani, Aliakbar
Abstract:
Temerature fluctuation of the Cosmic Microwave Background (CMB) is one of the key observebles of the modern cosmology. Today, it is widely believed that quantum fluctuation that are stretched to horizon scales during a period of acceleration expansion -- at the onset of evolution of the universe-- are responsible for these perturbations. In the simplest scenarios of the inflation, a scalar field is responsible for both nearly expansional expansion of the universe and the proimordial fluctuations. In this thesis, we investigate the models of inflation with an additional light degree of freedom. In particular, we employ the method of the Effective Field Theory to study the general structure of single field and multiple field inflationary models. As a new contribution, we present a model of double field inflation with a new light scalar degree of freedom, other than inflation, which has a mass which is modulated with the amplitude inflaton field. This kind of models are theortically well motivated and they have a rich phenomenology. Finally, we briefly review the observational consequences of thes models
Keywords:
Axion Monodromy ; Nongaussianity ; Cosmic Microwave Background (CMB) ; Effective Field Theory ; Inflation Effective Field Theory ; Inflation ; Entropic Perturbation ; Adiabatic Perturbation

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