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      The Study of Quantum Effects in Early Universe

      , Ph.D. Dissertation Sharif University of Technology Rostami, Abasat (Author) ; Golshani, Mehdi (Supervisor) ; Taghizadeh Firouzjaee, Javad (Co-Supervisor)
      Abstract
      In this thesis, we study two important quantum effects at deSitter spacetime and using the Schrödinger field theory, the power spectrum of massive non-interacting, minimally coupled scalars in a fixed de Sitter background would be obtained. To calculate the N-point function in Schrödinger field theory, the ”in-in” formalism is extended in the Friedmann- Lemaître-Robertson-Walker (FLRW) universe. This formalism in such picture would have a crucial role for evaluating the correlation functions of those quantum states naturally written in Schrödinger picture. We compute the three-point function for primordial scalar field fluctuation in the single field inflation by this in-in formalism. The... 
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