Gauge-invariant metric fluctuations from NKK theory of gravity: de Sitter expansion

Abstract

In this paper we study gauge-invariant metric fluctuations from a Noncompact Kaluza-Klein (NKK) theory of gravity in a de Sitter expansion. We recover the well known result $\delta \rho /\rho \simeq 2\Phi$, obtained from the standard 4D semiclassical approach to inflation. The spectrum for these fluctuations should be dependent of the fifth (spatial-like) coordinate.

version accepted in Phys. Lett. B

References in corpus (2)

• de Sitter inflationary expansion from a noncompact KK theory: a nonperturbative quantum (scalar) field formalism
• Origin of FRW cosmology in slow-roll inflation from noncompact Kaluza-Klein theory

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