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A standard scenario to form primordial black holes in the early universe isbased on a phase of ultra-slow-roll in single-field inflation when theamplitude of the short scale modes is enhanced compared to the CMB plateau.Based on general arguments, we show that the loop corrections to thelarge-scale linear power spectrum from the short modes are small and concludethat the scenario is not ruled out.

The Primordial Black Hole Formation from Single-Field Inflation is Not Ruled Out