Dibaryons cannot be the dark matter
Abstract
The hypothetical SU(3) flavor-singlet dibaryon state S with strangeness –2 has been discussed as a dark-matter candidate capable of explaining the curious 5-to-1 ratio of the mass density of dark matter to that of baryons. We study the early-universe production of dibaryons and find that irrespective of the hadron abundances produced by the QCD quark/hadron transition, rapid particle reactions thermalized the S abundance, and it tracked equilibrium until it “froze out” at a tiny value. For the plausible range of dibaryon masses (1860–1890 MeV) and generous assumptions about its interaction cross sections, S’s account for at most 10–11 of the baryon number and, thus, cannot be the dark matter. Although it is not the dark matter, if the S exists, it might be an interesting relic.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1501725
- Alternate Identifier(s):
- OSTI ID: 1611253
- Grant/Contract Number:
- FG02-13ER41958; SC0009924
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 99 Journal Issue: 6; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics; Dark matter; Hypothetical particle physics models; Particle dark matter
Citation Formats
Kolb, Edward W., and Turner, Michael S.. Dibaryons cannot be the dark matter. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.99.063519.
Kolb, Edward W., & Turner, Michael S.. Dibaryons cannot be the dark matter. United States. https://doi.org/10.1103/PhysRevD.99.063519
Kolb, Edward W., and Turner, Michael S.. Tue .
"Dibaryons cannot be the dark matter". United States. https://doi.org/10.1103/PhysRevD.99.063519.
@article{osti_1501725,
title = {Dibaryons cannot be the dark matter},
author = {Kolb, Edward W. and Turner, Michael S.},
abstractNote = {The hypothetical SU(3) flavor-singlet dibaryon state S with strangeness –2 has been discussed as a dark-matter candidate capable of explaining the curious 5-to-1 ratio of the mass density of dark matter to that of baryons. We study the early-universe production of dibaryons and find that irrespective of the hadron abundances produced by the QCD quark/hadron transition, rapid particle reactions thermalized the S abundance, and it tracked equilibrium until it “froze out” at a tiny value. For the plausible range of dibaryon masses (1860–1890 MeV) and generous assumptions about its interaction cross sections, S’s account for at most 10–11 of the baryon number and, thus, cannot be the dark matter. Although it is not the dark matter, if the S exists, it might be an interesting relic.},
doi = {10.1103/PhysRevD.99.063519},
journal = {Physical Review D},
number = 6,
volume = 99,
place = {United States},
year = {2019},
month = {3}
}
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https://doi.org/10.1103/PhysRevD.99.063519
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