Primordial Black Holes in Higgs-$R^2$ Inflation as a Whole Dark Matter

Abstract

Primordial black holes are produced in a minimal UV extension to the Higgs inflation with an included $R^2$ term. We show that for parameters consistent with Standard Model measurements and Planck observation results lead to $M_{\mathrm{PBH}}\in (10^{-16},10^{-15})M_{\odot }$ primordial black holes with significant abundance, which may consist the majority of dark matter.

Comments: 13 pages with references, 5 figures; v2: minor revisions, references added; v3: figure 1 and 4 updated, several comments and references added