Inflation with Light Species, A Possible Realization of Warm Inflation

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Hooshangi, Sina | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52036 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Abolhasani, Ali Akbar
Abstract:
In this project we investigate the effect of coupling of the inflaton with light particles which have oscillating mass that depends on inflaton. As the inflaton slowly rolls towards the minimum of its potential, the mass of other particles changes periodically(monodromy). The monodromy structure with tuning the parameters of model allows us to produce ultrarelativistic particles during inflation. These particles dilute with the expansion of the universe but continuous particle production leads to burst of particles at the end of inflation. It should be noted that other Warm Inflation models are phenomenological models which is assumed that during the inflation, the inflaton energy is transfered to radiation via some decay coefficient without any principal discussion. But this model which is motivated from high energy physics and string theory, predicts that with the presence of this monodromy structure during inflation, there is some radiation content during inflation
Keywords:
Axion Monodromy ; Warm Inflation ; Particle Production ; Inflationary Model