Acceptable Density Perturbations from Inflation Due to Quantum Gravitational Damping

Nonperturbative quantum gravitational effects can act as a damping mechanism in primordial inflation. It is shown that this effect can reduce the value of $\frac{\delta \rho }{\rho }$ to an acceptable value of ∼${10}^{-4\mathrm{}}$ in primordial inflation. The same effect reduces the gravitational-wave background by a factor ${10}^{-6\mathrm{}}$, making the primordial inflation viable.