Scalar perturbations in a primordial inflationary scenario
arXiv:hep-th/0104040 · doi:10.1103/PhysRevD.64.084007
Abstract
We compute the spectral index for scalar perturbations generated in a primordial inflationary model. In this model, the transition of the inflationary phase to the radiative era is achieved through the decay of the cosmological term leading a second order phase transition and the characteristics of the model allow to implement a set of initial conditions where the perturbations display a thermal spectrum when they emerge from the horizon. The obtained value for the spectral index is equal to 2, a result that depends very weakly on the various parameters of the model and on the initial conditions used.
12 pages, 2 figures