Sharif Digital Repository

In this project, in general, we have studied the particle production during and after the Inflation.Today, the Inflation is considered as a part of the standard model of cosmology and it solves so-called two cosmological problems: flatness and horizon problem. According to it,the universe after the inflation becomes supercool; however, the thing we observe today is in contradiction with this theory. The Reheating era is a time period in which the inflationary field gets to its minimum of potential and starts to socialite. Actually, here is the place in which the phenomenon of the particle production occurs. This period is called the Reheating era. therefore, it seems all particles which we... 

Inflation first introduced for solving the puzzles of the standard model of cosmology. Soon it became clear that this paradigm can provide a natural way for production of Initial conditions for the birth of large-scale structures: cosmological perturbations. But inflationary models are usually phenomenological models. They are constructed to solve the problems of the standard model of cosmology and explain the properties of cosmological fluctuations. Where do they come from? A property of a big family of inflationary models is the flatness of their potential. What would may be the cause of this flatness? . . .. In this thesis our purpose is searching about one probable field theoretic root...