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

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

2005-12-16

arxiv.org/abs/gr-qc/0512100v4

Phys.Lett. B635 (2006) 243-246

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

version accepted in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.03.003

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 <\delta\rho/\rho_b$ depends on the coupling of $\Phi$ with $\delta\phi$ and the spectral index of its spectrum is: $0.9483 < n_1 < 1$.

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