A diagrammatic approach to the spectrum of cosmological perturbations

摘要

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. (C) 2001 Published by Elsevier Science B.V. References: 11