Inflaton and metric fluctuations in the early universe from a 5D vacuum state

摘要

In this Letter we complete a previously introduced formalism to study the gauge-invariant metric fluctuations from a noncompact Kaluza-Klein theory of gravity, to study the evolution of the early universe. The evolution of both, metric and inflaton field fluctuations are reciprocally related. We obtain that /rho b depends on the coupling of Phi with delta psi and the spectral index of its spectrum is 0.9483 < n(1) < 1. (c) 2006 Elsevier B.V. All rights reserved.