Parametric coincidence in the baryon to dark matter ratio from Affleck-Dine baryogenesis and UV freeze-in dark matter

Chang, Jae Hyeok; Shin, Chang Sub; Unwin, James

doi:10.1103/y78v-zg2g

Parametric coincidence in the baryon to dark matter ratio from Affleck-Dine baryogenesis and UV freeze-in dark matter

Journal Article · Wed Oct 15 00:00:00 EDT 2025 · Physical Review D

DOI:https://doi.org/10.1103/y78v-zg2g· OSTI ID:2569224

^[1]; ^[2]; ^[3]

Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Univ. of Illinois, Chicago, IL (United States)
Chungnam National Univ., Daejeon (Korea, Republic of); Institute for Basic Science (IBS), Daejeon (Korea, Republic of); Korea Institute for Advanced Study, Seoul (Korea, Republic of)
Univ. of Illinois, Chicago, IL (United States)

We highlight that the observed concurrence between the baryon and dark matter relic densities can be explained via a parametric coincidence between two distinct production mechanisms: Affleck-Dine baryogenesis and dark matter UV freeze-in. In the Affleck-Dine mechanism, the baryon asymmetry is naturally proportional to the inflationary reheating temperature 𝑇_rh , which also plays a critical role in setting the relic abundance of UV freeze-in dark matter. Since Affleck-Dine baryogenesis requires flat directions in the potential, the framework is inherently supersymmetric, offering compelling UV freeze-in dark matter candidates such as the gravitino. We outline scenarios in which 𝑇_rh simultaneously determines both relic abundances, resulting in a baryon-to-dark matter ratio of order unity that is largely insensitive to 𝑇_rh . We also discuss the conditions required to avoid Q-ball formation or dark matter production by other mechanisms, such as next-to-lightest supersymmetric particle decays, to preserve the parametric coincidence between baryon and dark matter abundances.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); National Science Foundation; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: 89243024CSC000002

OSTI ID:: 2569224

Report Number(s):: FERMILAB-PUB--25-0376-T-V; oai:inspirehep.net:2929328; arXiv:2506.03269

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 7 Vol. 112; ISSN 2470-0010; ISSN 2470-0029

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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