Tensor-induced backreaction in ultra-slow-roll inflation limits the drop of the first slow-roll parameter and suppresses the curvature power spectrum peak from roughly 10^-3 to about 4x10^-6, strongly reducing primordial black hole production.
The cosmological backreaction: gauge (in)dependence, observers and scalars
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abstract
We discuss several issues related to a recent proposal for defining classical spatial averages to be used in the so-called cosmological backreaction problem. In the large averaging-volume limit all gauge dependence disappears and different averages can be univocally characterized by the observers associated with different scalar fields. The relation between such averaging procedure and the standard one is emphasized and a gauge invariant way to select different observers is presented. For finite averaging volumes we show that, within our proposal, a residual gauge dependence is left, but is suppressed by several effects.
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Tensor-Induced Backreaction in Ultra-Slow-Roll Inflation
Tensor-induced backreaction in ultra-slow-roll inflation limits the drop of the first slow-roll parameter and suppresses the curvature power spectrum peak from roughly 10^-3 to about 4x10^-6, strongly reducing primordial black hole production.