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

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

2005-08-10

arxiv.org/abs/gr-qc/0508044v3

Phys.Lett. B632 (2006) 6-12

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

version accepted in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.10.037

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.

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