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Density fluctuations in Brans-Dicke inflation

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arxiv gr-qc/9502002 v1 pith:OKMGQJEP submitted 1995-02-01 gr-qc astro-ph

Density fluctuations in Brans-Dicke inflation

classification gr-qc astro-ph
keywords modeperturbationsadiabaticbrans-dickedensityfluctuationsgravityinflation
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Spectrum of density perturbations in the Universe generated from quantum-gravitational fluctuations in slow-roll-over inflationary scenarios with the Brans-Dicke gravity is calculated. It is shown that after inflation the isocurvature mode of perturbations may be neglected as compared to the adiabatic mode, and that an amplitude of the latter mode is not significantly different from that in the Einstein gravity. However, the account of the isocurvature mode is necessary to obtain the quantitatively correct spectrum of adiabatic perturbations.

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    astro-ph.CO 2026-02 conditional novelty 5.0

    Two-stage, two-field inflation with a simple quadratic-plus-interaction potential produces repeated field-space turns that amplify the curvature power spectrum by several orders of magnitude.