PBH formation in EFT of single field inflation with sharp transition

Sayantan Choudhury, Sudhakar Panda, M. Sami

Physics Letters B, 2023

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DOI 10.1016/j.physletb.2023.138123

Data confidence 85 high

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Abstract

Using the Effective Field Theory (EFT) framework of single field inflation, we investigate the possibility of the formation of Primordial Black Holes (PBHs) in the Slow Roll (SR) to Ultra Slow Roll (USR) sharp transition. We demonstrate that, due to one-loop correction to the power spectrum, causality is violated (cs>1) for the mass range of PBHs, MPBH>102gm created during the said transition. We find that non-canonical features with cs<1 worsen the predictions of the canonical framework of single-field inflation.