Quantum Field Theory On Time-dependent Background: The Case Of Neutrino and Lepton Asymmetry Generation

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Bashiri, Javad | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51104 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Torabian, Mahdi
Abstract:
One of the open questions in particle physics and cosmology is matter-antimatter asymmetry in the Universe. Observations at different scales in the early universe indicates that the number of baryons and leptons are greater than the number of anti-baryons and anti-leptons. Various mechanisms in the last 50 years, have been proposed to generate this asymmetry from a symmetric Universe. They can be classified into two groups: models which add new particles and interactions and models which consider gravity and time dependent background fields. The basic difference is that if they respect CPT symmetry or not. In this thesis we take the second approach. We study the neutrino sector of the standard model (extended with heavy right handed neutrinos) on time dependent scalar, metric and torsion fields in the FRW universe and observe that non-zero lepton number could be generated
Keywords:
Early Universe ; Asymmetry Matter and Antimatter ; Leptogensis ; Neutrino ; Quantum Field Theory ; Time Dependent Background ; Torsion in FRW Space

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