Article ID Journal Published Year Pages File Type
10725304 Physics Letters B 2006 7 Pages PDF
Abstract
In this Letter we study gauge-invariant metric fluctuations from a noncompact Kaluza-Klein (NKK) theory of gravity in de Sitter expansion. We recover the well-known result δρ/ρ≃2Φ, 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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Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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Gauge-invariant metric fluctuations from NKK theory of gravity: de Sitter expansion
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