http://arxiv.org/abs/2003.05969
A generic feature of models of inflation obtained from string compactifications is correlations between the model parameters and the post-inflationary evolution of the universe. Thus, the post-inflationary evolution depends on the inflationary model parameters and accurate inflationary predictions require that this be incorporated in the evolution of the primordial spectrum. The fibre inflation model is a promising model of inflation constructed in type IIB string theory. This model has two interesting features in its post-inflationary evolution. The reheating temperature of the model is directly correlated with the model parameters. The model also necessarily predicts some dark radiation, which can be sizable for certain choices of discrete parameters in the model. We analyse this model in detail using publicly available codes – ModeChord and CosmoMC with the latest Planck+BICEP2/Keck array data to constrain the model parameters and $N_{\rm pivot}$ (the number of e-foldings between horizon exit of CMB modes and the end of inflation). Our analysis sets up the basic methods necessary to extract precise inflationary prediction in string models incorporating correlations between model parameters and post-inflationary evolution.
S. Bhattacharya, K. Dutta, M. Gangopadhyay, et. al.
Mon, 16 Mar 20
47/57
Comments: 12 pages, 4 figures