Stabilising the Planck mass shortly after inflation
Carsten van de Bruck, Adam J. Christopherson, Mathew Robinson
TL;DR
This paper explores a two-field early universe model where a second scalar field stabilizes the Planck mass, revealing that its non-minimal coupling enhances the primordial power spectrum after inflation.
Contribution
It introduces a novel two-field inflationary model with a non-minimally coupled stabilizing field affecting primordial perturbations.
Findings
Non-adiabatic pressure perturbation sourced by the second field.
Boost in primordial power spectrum amplitude after inflation.
Numerical analysis confirming the impact of the stabilizing field.
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.
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