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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 48416 (04)
- University: Sharif University of Technology
- Department: Physics
- Advisor(s): Mansouri, Reza
- Abstract:
- Inflation is the leading paradigm for the theory of early universe and the mechanism for generating the seeds of perturbation in cosmic microwave background and large scale structure. In this thesis various aspects of primordial anisotropies and the effects of long mode during inflation are studied. There exist two powerful tools in studying the effects of super-horizon inflationary perturbations, namely, Maldacena’s consistency condition and Weinberg’s theorem. However, there are inflationary models, such as solid inflation and non-attractor inflation, which evade these theorems and in this thesis we study their consequences and features. At first we study statistical anisotropy in the model of anisotropic solid inflation and present its cosmological predictions. Then we study the observable fossil of gravitational waves in solid inflation. In addition, we use powerful methods of effective field theory to study the model of non-attractor inflation. As mentioned, both solid inflation and non-attractor inflation violate Weinberg’s theorem. We critically review Weinberg’s theorem and uncover some hidden assumptions of that theorem which are violated in solid inflation and non-attractor inflation
- Keywords:
- Inflationary Cosmology ; Early Universe ; Anisotropic Inflation ; Super-horizon Inflationary Perturbation
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