Seeding baryonic dark matter
Abstract
It has been proposed that primordial quark pellets or PQPs --ultra-dense quark-matter mini- stars-- formed at T∼ 1 GeV may be a good candidate accounting for the dark matter of the universe. If correct, dark matter would consist of very compact objects with a maximum mass of 10−2 M⊙ and radii of approximately 100 m, although smaller objects would be much more abundant and encompass the bulk of the dark matter content. Here we describe a viable formation mechanism based on the enhancement of the local baryon density when supra-horizon Peccei-Quinn domain walls formed at an earlier epoch sweep and accumulate quarks and gluons before entering the horizon. Assuming an efficient baryon concentration by contracting Peccei-Quinn domain walls, we derive the resulting primordial quark pellet mass spectrum, minimum mass and cosmological abundance.
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BibTeX
@misc{espriu2026seeding,
title = {{Seeding baryonic dark matter}},
author = {Domenec Espriu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.17395},
eprint = {2608.17395},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.17395},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Seeding baryonic dark matter
AU - Domenec Espriu
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2608.17395
UR - https://arxiv.org/abs/2608.17395
AB - It has been proposed that primordial quark pellets or PQPs --ultra-dense quark-matter mini- stars-- formed at T∼ 1 GeV may be a good candidate accounting for the dark matter of the universe. If correct, dark matter would consist of very compact objects with a maximum mass of 10^−2 M_⊙ and radii of approximately 100 m, although smaller objects would be much more abundant and encompass the bulk of the dark matter content. Here we describe a viable formation mechanism based on the enhancement of the local baryon density when supra-horizon Peccei-Quinn domain walls formed at an earlier epoch sweep and accumulate quarks and gluons before entering the horizon. Assuming an efficient baryon concentration by contracting Peccei-Quinn domain walls, we derive the resulting primordial quark pellet mass spectrum, minimum mass and cosmological abundance.
ER -