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We propose a new scenario for the formation of asteroid-mass primordial black holes (PBHs). Our mechanism is based on the annihilation of the string-wall network associated with the breaking of a $U(1)$ global symmetry into a discrete $Z_N$ symmetry.
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ad83d1512093dc61e01edf3b3efa5b4b