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

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/ρ_b$dependsonthecouplingof$Φ$with$δϕ$andthespectralindexofitsspectrumis:$0.9483 < n_1 < 1$.

version accepted in Phys. Lett. B

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Cited by in corpus (4)

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• Scalar Metric fluctuations in space time matter inflation
• Non-perturbative scalar gauge-invariant metric fluctuations from the Ponce de Leon metric in the STM theory of gravity
• Gauge invariant metric fluctuations in the early universe from STM theory of gravity: nonperturbative formalism