Inflaton and metric fluctuations in the early universe from a 5D vacuum state
Agustin Membiela, Mauricio Bellini
Abstract
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 <δρ/ρb depends on the coupling of Φ with δϕ and the spectral index of its spectrum is: 0.9483 < n1 < 1$.
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