Acceptable density perturbations from inflation due to quantum gravitational damping

Abstract

Nonperturbative quantum gravitational effects can act as a damping mechanism in primordial inflation. It is shown that this effect can reduce the value of δρ/ρ to an acceptable value of ∼10-4 in primordial inflation. The same effect reduces the gravitational-wave background by a factor 10-6, making the primordial inflation viable.