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Cited by 264Dark Matter and Cosmic PhenomenaCosmology and Gravitation TheoriesGalaxies: Formation, Evolution, Phenomena

Primordial black hole formation during the QCD epoch

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Jedamzik, Karsten·1997·Physical Review D
DOI 10.1103/physrevd.55.r5871
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Abstract

We consider the formation of horizon-size primordial black holes (PBH's) from pre-existing density fluctuations during cosmic phase transitions. It is pointed out that the formation of PBH's should be particularly efficient during the QCD epoch due to a substantial reduction of pressure forces during adiabatic collapse, or equivalently, a significant decrease in the effective speed of sound during the color-confinement transition. Our considerations imply that for generic initial density perturbation spectra PBH mass functions are expected to exhibit a pronounced peak on the QCD-horizon mass scale $\ensuremath{\sim}{1M}_{\ensuremath{\bigodot}}.$ This mass scale is roughly coincident with the estimated masses for compact objects recently observed in our galactic halo by the MACHO Collaboration. Black holes formed during the QCD epoch may offer an attractive explanation for the origin of halo dark matter evading possibly problematic nucleosynthesis and luminosity bounds on baryonic halo dark matter.

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Crossref · 10.1103/physrevd.55.r5871

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31 of 31 references verified0 citation errors · 0 not checkable

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  • A variety of astrophysical observations including Zeeman splitting, synchrotron emission, Faraday rotation measurements combined with pulsar dispersion measurements and polarization measurements suggest the presence of large scale magnetic fields.

    “A variety of astrophysical observations including Zeeman splitting, synchrotron emission, Faraday rotation measurements (RM) combined with pulsar dispersion measurements (DM) and polarization measurements suggest the presence of large scale magnetic fields[112, 113].”

    From Phase Transitions in the Early and Present Universe (2006) · cites this paper as [112]

  • The strength of typical galactic magnetic fields is of the order ∼μG and they are correlated on very large scales up to galactic or even larger reaching to scales of cluster of galaxies ∼1 Mpc.

    “The strength of typical galactic magnetic fields is of the order ∼ µ G [112, 113] and they are correlated on very large scales up to galactic or even larger reaching to scales of cluster of galaxies ∼ 1 Mpc[112].”

    From Phase Transitions in the Early and Present Universe (2006) · cites this paper as [112]

  • It is currently agreed that a variety of dynamo mechanisms are efficient in amplifying seed magnetic fields with typical growth rates Γ ∼ Gyr^-1 over time scales ∼10^-12 Gyr.

    “It is currently agreed that a variety of dynamo mechanisms are efficient in amplifying seed magnetic fields with typical growth rates Γ ∼ Gyr -1 over time scales ∼ 10 -12 Gyr [112].”

    From Phase Transitions in the Early and Present Universe (2006) · cites this paper as [112]

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Authors
Jedamzik, K.
Affiliations
Lawrence Livermore National Laboratory (US)
Corresponding author
Jedamzik, Karsten
ORCID
Jedamzik, Karsten
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
1997-05-15
Volume
55
Issue
10
Pages
R5871-R5875
ISSN
  • 0556-2821 (ISSN-L)
  • 1089-4918
DOI
10.1103/physrevd.55.r5871
OpenAlex
W2593932764
Cited by
264
References
31
Citations by year
2026: 17 · 2025: 19 · 2024: 17 · 2023: 19 · 2022: 24 · 2021: 20 · 2020: 15 · 2019: 9 · 2018: 10 · 2017: 10 · 2016: 6 · 2015: 1 · 2014: 5 · 2013: 5 · 2012: 2
FWCI
10.51
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords
primordial black holes, cosmological phase transitions, adiabatic collapse, effective sound speed, density fluctuations, black hole mass function, MACHOs, halo dark matter, compact stars

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