Speaker
Description
The scenario of warm inflationary scenario is reconsidered where the tachyon field plays the role of inflaton which drives inflation and interacts with the radiation during inflation. The interaction term includes a dissipative coefficient, and the model is considered for two different and common choices of it. The main perturbation parameters are obtained for the strong dissipative regime, and by applying the latest observational data it is sought to find the best values for the free constants of the model which brings the model prediction in great consistency with data. Then, these results for the model are examined to find out whether they are in agreement with the fundamental conditions of the model. It is realized that they are always not in agreement with these conditions and we need to restrict them. After that, we are going to consider the recently proposed swampland criteria, which imposes two conditions on the inflationary models. Although warm inflation is assumed as one of the inflationary models that is able to satisfy the swampland criteria, the precise investigation determines that not for all cases it happens. In fact, for the second case of the dissipation coefficient, where it depends only on the scalar field, the model could come to an agreement with observational data, however, it is in direct tension with the swampland criteria. But, for the second case, where the dissipation coefficient depends on both the scalar field and the temperature, the model has a great agreement with observational data, and also it could properly satisfy the swampland criteria.
Apply to be considered for a student ; award (Yes / No)?
Yes
Level for award;(Hons, MSc, PhD, N/A)?
PostDoc
