| Name: Subhankar Saha |
| Affiliation: PhD, Indian Institute of Science Education and Research, Bhopal. |
| Conference ID: ASI2026_405 |
| Title: A novel approach for investigation of complete dynamical evolution of space-time and scalar field during inflation |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Subhankar Saha(Indian Institute of Science Education and Research, Bhopal. Bhopal-462066, India.), Rajib Saha(Indian Institute of Science Education and Research, Bhopal. Bhopal-462066, India.) |
| Abstract: Inflation is incorporated into the standard big bang cosmology as a fundamental mechanism to solve several inconsistances of the theory. The experimental link of inflation is established through an enormous growth of the event horizon in early evolutionary phases of the universe and through the perturbation modes of the CMB power spectrum. The dynamics of inflation is built on a real scalar field, the so called inflaton, and its potential. This field is generally consided as minimally coupled to the space-time by following the Einstein-Hilbert action. From the action, we derive the Einstein equations to explain the mechanics of the field on the specific space-time. In cosmology, the space-time is denoted by the FRW metric to maintain the homogeniety and isotropy of the observed universe. Hence, a time dependent scale factor is multiplied to the spatial directions of a flat Minkowsky metric. Altough the most adopted approach for inflationary model building is to choose a potential for the inflaton field, the scale factor is an alternative and equally fundamental avenue which we focus in this work. The form of expansion of the universe during inflation caused by some basic and yet physically well motivated forms of scale factors are investigated. With the detailed study of the complete slow-roll and beyond slow-roll regime and even during post inflationary period, this work provides a novel and self contained cosmological model for the inflationary epoch. The construction of the model assumes only one minimally coupled real scalar field as inflaton and elaborates to obtain the spectral index and the tensor to scalar ratio as prescribed by the experiments like Planck, BICEP/Keck, and ACT missions. |
