Gauge-invariant metric fluctuations from NKK theory of gravity: de Sitter expansion |
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| Authors: | José Edgar Madriz Aguilar,Mariano Anabitarte,Mauricio Bellini |
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| Affiliation: | 1. Instituto de Física y Matemáticas, AP 2-82, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, 58040 Michoacán, Mexico;2. Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, 7600 Mar del Plata, Argentina;3. Consejo Nacional de Ciencia y Tecnología (CONICET), Argentina |
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| 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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| Keywords: | 04.20.Jb 11.10.Kk 98.80.Cq |
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