Nonperturbative quantum gravitational effects can act as a damping mechanism in primordial inflation. It is shown that this effect can reduce the value of δρρ 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.
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Τ. Padmanabhan (1988) studied this question.
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