A diagrammatic approach to the spectrum of cosmological perturbations
arXiv:gr-qc/0101118 · doi:10.1016/S0370-2693(01)00220-9
Abstract
We compute the spectral distribution of the quantum fluctuations of the vacuum, amplified by inflation, after an arbitrary number of background transitions. Using a graphic representation of the process we find that the final spectrum can be completely determined trough a synthetic set of working rules, and a list of simple algebraic computations.
12 pages, Latex, four figures included using epsfig. To appear in Phys. Lett. B