Stabilising the Planck mass shortly after inflation
arXiv:1503.06490 · doi:10.1103/PhysRevD.91.123503
Abstract
We consider a model of the early universe which consists of two scalar fields: the inflaton, and a second field which drives the stabilisation of the Planck mass (or gravitational constant). We show that the non-minimal coupling of this second field to the Ricci scalar sources a non-adiabatic pressure perturbation. By performing a fully numerical calculation we find, in turn, that this boosts the amplitude of the primordial power spectrum after inflation.
arXiv comment13 pages, 5 figs; v2: version to appear in PRD
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