Formation of the universe without (above) and with (below) primordial black holes

In cosmology, primordial black holes (PBHs) are hypothetical black holes that formed soon after the Big Bang. In the inflationary era and early radiation-dominated universe, extremely dense pockets of subatomic matter may have been tightly packed to the point of gravitational collapse, creating primordial black holes without the supernova compression needed to make black holes today. Because the creation of primordial black holes would pre-date the first stars, they are not limited to the narrow mass range of stellar black holes.

In 1966, Yakov Zeldovich and Igor Novikov first proposed the existence of such black holes,[1] while the first in-depth study was conducted by Stephen Hawking in 1971.[2] However, their existence has not been proven and remains hypothetical. In September 2022, primordial black holes were proposed by some researchers to explain the unexpected very large early galaxies discovered by the James Webb Space Telescope (JWST).[3][4]

PBHs have long been considered possibly important if not nearly exclusive components of dark matter,[5][6][7][8] the latter perspective having been strengthened by both LIGO/Virgo interferometer gravitational wave and JWST observations.[9][10] Early constraints on PBHs as dark matter usually assumed most black holes would have similar or identical ("monochromatic") mass, which was disproven by LIGO/Virgo results,[11][12][13] and further suggestions that the actual black hole mass distribution is broadly platykurtic were evident from JWST observations of early large galaxies.[9][10]

History

Depending on the model, primordial black holes could have initial masses ranging from 10−8 kg[14] (the so-called Planck relics) to more than thousands of solar masses. However, primordial black holes originally having mass lower than 1011 kg would not have survived to the present due to Hawking radiation, which causes complete evaporation in a time much shorter than the age of the Universe.[15] Primordial black holes are non-baryonic,[16] and as such are plausible dark matter candidates.[10][5][11][12][8][13][9] Primordial black holes are also good candidates for being the seeds of the supermassive black holes at the center of massive galaxies, as well as of intermediate-mass black holes.[17][3][4]

Primordial black holes belong to the class of massive compact halo objects (MACHOs). They are naturally a good dark matter candidate: they are (nearly) collision-less and stable (if sufficiently massive), they have non-relativistic velocities, and they form very early in the history of the Universe (typically less than one second after the Big Bang).[18] Nevertheless, critics maintain that tight limits on their abundance have been set up from various astrophysical and cosmological observations, which would exclude that they contribute significantly to dark matter over most of the plausible mass range.[19] However, new research has provided for the possibility again, whereby these black holes would sit in clusters with a 30-solar-mass primordial black hole at the center.[20][21]

In March 2016, one month after the announcement of the detection by Advanced LIGO/VIRGO of gravitational waves emitted by the merging of two 30 solar mass black holes (about 6×1031 kg), three groups of researchers proposed independently that the detected black holes had a primordial origin.[22][23][24][25] Two of the groups found that the merging rates inferred by LIGO are consistent with a scenario in which all the dark matter is made of primordial black holes, if a non-negligible fraction of them are somehow clustered within halos such as faint dwarf galaxies or globular clusters, as expected by the standard theory of cosmic structure formation. The third group claimed that these merging rates are incompatible with an all-dark-matter scenario and that primordial black holes could only contribute to less than one percent of the total dark matter. The unexpected large mass of the black holes detected by LIGO has strongly revived interest in primordial black holes with masses in the range of 1 to 100 solar masses. It is still debated whether this range is excluded or not by other observations, such as the absence of micro-lensing of stars,[26] the cosmic microwave background anisotropies, the size of faint dwarf galaxies, and the absence of correlation between X-ray and radio sources toward the galactic center.

In May 2016, Alexander Kashlinsky suggested that the observed spatial correlations in the unresolved gamma-ray and X-ray background radiations could be due to primordial black holes with similar masses, if their abundance is comparable to that of dark matter.[27]

In August 2019, a study was published opening up the possibility of making up all dark matter with asteroid-mass primordial black holes (3.5 × 10−17 – 4 × 10−12 solar masses, or 7 × 1013 – 8 × 1018 kg).[28]

In September 2019, a report by James Unwin and Jakub Scholtz proposed the possibility of a primordial black hole (PBH) with mass 5–15 MEarth (Earth masses), about the diameter of a tennis ball, existing in the extended Kuiper Belt to explain the orbital anomalies that are theorized to be the result of a 9th planet in the solar system.[29][30]

In October 2019, Derek Inman and Yacine Ali-Haïmoud published an article in which they discovered that the nonlinear velocities that arise from the structure formation are too small to significantly affect the constraints that arise from CMB anisotropies[31]

In September 2021, the NANOGrav collaboration announced that they had found a low-frequency signal that could be attributed to gravitational waves and potentially could be associated with PBHs.[32]

In September 2022, primordial black holes were used to explain the unexpected very large early (high redshift) galaxies discovered by the James Webb Space Telescope.[3][4]

On 26 November 2023, evidence, for the first time, of an overmassive black hole galaxy (O.B.G.), the result of "heavy black hole seed formation from direct collapse", an alternative way of producing a black hole other than the collapse of a dead star, was reported. This discovery was found in studies of UHZ1, a very early galaxy containing a quasar, by the Chandra X-ray Observatory and James Webb Space Telescope.[33][34]

Formation

Primordial black holes were possibly formed by the collapse of overdense regions in the inflationary or early radiation-dominated universe.[35]

Primordial black holes could have formed in the very early Universe (less than one second after the Big Bang) during the inflationary era, or in the very early radiation-dominated era. The essential ingredient for the formation of a primordial black hole is a fluctuation in the density of the Universe, inducing its gravitational collapse. One typically requires density contrasts (where is the density of the Universe) to form a black hole.[36]

Production mechanisms

There are several mechanisms able to produce such inhomogeneities in the context of cosmic inflation (in hybrid inflation models.) Some examples include:

Axion inflation

Axion inflation is a theoretical model in which the axion acts as an inflaton field. Because of the time period it is created at, the field is oscillating at its minimal potential energy. These oscillations are responsible for the energy density fluctuations in the early universe.[37]

Reheating

Reheating is the transitory process between the inflationary and the hot, dense, radiation-dominated period. During this time the inflaton field decays into other particles. These particles begin to interact in order to reach thermal equilibrium. However, if this process is incomplete it creates density fluctuations, and if these are big enough they could be responsible for the formation of PBH.[38]

Cosmological phase transitions

Cosmological phase transitions may cause inhomogeneities in different ways depending on the specific details of each transition. For example, one mechanism is concerned with the collapse of overdense regions that arise from these phase transitions, while another mechanism involves highly energetic particles that are produced in these phase transitions and then go through gravitational collapse forming PBHs.[39]

Implications

Dark matter problem

The dark matter problem, proposed in 1933 by Swiss-American astronomer Fritz Zwicky, refers to the fact that scientists still don't know what form dark matter takes. PBH can solve that in a few ways. First, if PBHs accounted for all or a significant amount of the dark matter in the universe, this could explain the gravitational effects seen in galaxies and galactic clusters. Secondly, PBHs have different proposed production mechanisms. Unlike WIMPs, they can emit gravitational waves that interact with regular matter. Finally, the discovery of PBHs could explain some of the observed gravitational lensing effects that couldn't arise from ordinary matter. While evidence that primordial black holes may constitute dark matter is inconclusive as of 2023, researchers such as Bernard Carr and others are strong proponents.[9][10][40][11][12][8][13][5][41]

Galaxy formation

Since primordial black holes do not necessarily have to be small (they can have any size), they may have contributed to formation of galaxies, such as those earlier than expected.[3][4]

Cosmological domain wall problem

The cosmological domain wall problem, proposed in 1974 by Soviet physicist Yakov Zeldovich, discussed the formation of domain walls during phase transitions of the early universe and what could arise from their large energy densities. PBHs could serve as a solution to this problem in various ways. One explanation could be that PBHs can prevent the formation of domain walls due to them exerting gravitational forces on the surrounding matter making it clump and theoretically preventing the formation of said walls. Another explanation could be that PBHs could decay domain walls; if these were formed in the early universe before PBHs then due to gravitational interactions these could eventually collapse into PBHs. Finally, a third explanation could be that PBHs do not violate the observational constraints; if PBHs in the 1015-1016 gram mass range were to be detected then these would have the right density to make up all dark matter in the universe without violating constraints, thus the domain wall problem wouldn't arise.[42]

Cosmological monopole problem

The Cosmological monopole problem, also proposed by Yakov Zeldovich in the late 1970s, consisted of the absence of magnetic monopoles nowadays. PBHs can also serve as a solution to this problem. To start, if magnetic monopoles did exist in the early universe these could have gravitationally interacted with PBHs and been absorbed thus explaining their absence. Another explanation due to PBHs could be that PBHs would have exerted gravitational forces on matter causing it to clump and dilute the density of magnetic monopoles.[43]

String theory

General relativity predicts the smallest primordial black holes would have evaporated by now, but if there were a fourth spatial dimension – as predicted by string theory – it would affect how gravity acts on small scales and "slow down the evaporation quite substantially".[44] In essence, the energy stored in the fourth spatial dimension as a stationary wave would bestow a significant rest mass to the object when regarded in the conventional four-dimensional space-time. This could mean there are several thousand primordial black holes in our galaxy. To test this theory, scientists will use the Fermi Gamma-ray Space Telescope, which was put into orbit by NASA on June 11, 2008. If they observe specific small interference patterns within gamma-ray bursts, it could be the first indirect evidence for primordial black holes and string theory.

Observational limits and detection strategies

A variety of observations have been interpreted to place limits on the abundance and mass of primordial black holes:

Lifetime, Hawking radiation and gamma-rays: One way to detect primordial black holes, or to constrain their mass and abundance, is by their Hawking radiation. Stephen Hawking theorized in 1974 that large numbers of such smaller primordial black holes might exist in the Milky Way in our galaxy's halo region. All black holes are theorized to emit Hawking radiation at a rate inversely proportional to their mass. Since this emission further decreases their mass, black holes with very small mass would experience runaway evaporation, creating a burst of radiation at the final phase, equivalent to a hydrogen bomb yielding millions of megatons of explosive force.[45] A regular black hole (of about 3 solar masses) cannot lose all of its mass within the current age of the universe (they would take about 1069 years to do so, even without any matter falling in). However, since primordial black holes are not formed by stellar core collapse, they may be of any size. A black hole with a mass of about 1011 kg would have a lifetime about equal to the age of the universe. If such low-mass black holes were created in sufficient number in the Big Bang, we should be able to observe explosions by some of those that are relatively nearby in our own Milky Way galaxy. NASA's Fermi Gamma-ray Space Telescope satellite, launched in June 2008, was designed in part to search for such evaporating primordial black holes. Fermi data set up the limit that less than one percent of dark matter could be made of primordial black holes with masses up to 1013 kg. Evaporating primordial black holes would have also had an impact on the Big Bang nucleosynthesis and change the abundances of light elements in the Universe. However, if theoretical Hawking radiation does not actually exist, such primordial black holes would be extremely difficult, if not impossible, to detect in space due to their small size and lack of large gravitational influence.

Temperature anisotropies in the cosmic microwave background: Accretion of matter onto primordial black holes in the early Universe should lead to energy injection in the medium that affects the recombination history of the Universe. This effect induces signatures in the statistical distribution of the cosmic microwave background (CMB) anisotropies. The Planck observations of the CMB exclude that primordial black holes with masses in the range 100–104 solar masses contribute importantly to the dark matter,[46] at least in the simplest conservative model. It is still debated whether the constraints are stronger or weaker in more realistic or complex scenarios.

Gamma-ray signatures from annihilating dark matter: If the dark matter in the Universe is in the form of weakly interacting massive particles or WIMPs, primordial black holes would accrete a halo of WIMPs around them in the early universe.[47] The annihilation of WIMPs in the halo leads to a signal in the gamma-ray spectrum which is potentially detectable by dedicated instruments such as the Fermi Gamma-ray Space Telescope.[48]

In the future, new limits will be set up by various observations:

  • The Square Kilometre Array (SKA) radio telescope will probe the effects of primordial black holes on the reionization history of the Universe, due to energy injection into the intergalactic medium, induced by matter accretion onto primordial black holes.[49]
  • LIGO, VIRGO and future gravitational waves detectors will detect new black hole merging events, from which one could reconstruct the mass distribution of primordial black holes.[23] These detectors could allow distinguishing unambiguously between primordial or stellar origins if merging events involving black holes with a mass lower than 1.4 solar mass are detected. Another way would be to measure the large orbital eccentricity of primordial black hole binaries.[50]
  • Gravitational wave detectors, such as the Laser Interferometer Space Antenna (LISA) and pulsar timing arrays, will also probe the stochastic background of gravitational waves emitted by primordial black hole binaries when they are still orbiting relatively far from each other.[51]
  • New detections of faint dwarf galaxies, and observations of their central star clusters, could be used to test the hypothesis that these dark matter-dominated structures contain primordial black holes in abundance.
  • Monitoring star positions and velocities within the Milky Way could be used to detect the influence of a nearby primordial black hole.
  • It has been suggested[52][53] that a small black hole passing through the Earth would produce a detectable acoustic signal. Because of its tiny diameter and large mass as compared to a nucleon, as well as its relatively high speed, a primordial black hole would simply transit Earth virtually unimpeded with only a few impacts on nucleons, exiting the planet with no ill effects.
  • Another way to detect primordial black holes could be by watching for ripples on the surfaces of stars. If the black hole passed through a star, its density would cause observable vibrations.[54][55]
  • Monitoring quasars in the microwave wavelength and detection of the wave optics feature of gravitational microlensing by the primordial black holes.[56]

Facilities able to provide PBH measurement

None of these facilities are focused on the direct detection of PBH due to them being a theoretical phenomenon, but the information collected in each respective experiment provides secondary data which can help provide insight and constraints on the nature of PBHs.s[57]

GW-detectors

  • LIGO/VIRGO- These detectors already place important constraints on the limits of PBHs. However, they're always in the search for new unexpected signals; if they detect a black hole in the mass range that does not correspond to stellar evolution theory, it could serve as evidence for PBHs.
  • Cosmic Explorer/Einstein Telescope- Both of these projects serve as the next generation of LIGO/VIRGO, these would increase sensitivity around the 10–100 Hz band and would allow to probe PBH information at higher redshifts
  • NANOGrav-This collaboration detected a stochastic signal but it is not yet a certified gravitational wave signal since quadrupolar correlations have not been detected. But, should this be confirmed, it could serve as evidence for sub-solar mass PBHs.
  • Laser Interferometer Space Antenna(LISA)- Like any GW detector, LISA has great potential to detect PBHs. The uniqueness of LISA lies with the ability to detect extreme mass ratio inspirals  when low mass black holes merge with massive objects. Due to its sensitivity it will also allow for the detection and confirmation of the stochastic NANOGrav signal.
  • AEDGE Atomic Experiment for Dark Matter and Gravity Exploration in Space- This proposed mid-range gravitational wave experiment has a uniqueness which lies in its detection ability of intermediate mass ratio mergers like the ones theorized during early supermassive black hole assembly, should the detection of these happen it would serve as evidence for PBHs.

Space telescopes

  • Nancy Grace Roman Space Telescope (WFIRST)- As a space telescope, WFIRST will have the capacity of detecting or at least placing constraints on PBHs through different types of lensing, one of which is Astrometric Lensing. When an object passes in front of a known light source, such as a star, it slightly (to the order of microarcseconds) shifts its position and this is known as Astrometric lensing.

Sky Surveys

  • Vera C. Rubin Observatory (LSST)- This will provide the capability of directly measuring the mass function of compact objects by microlensing. It will be able to observe both low and high-mass objects thus placing constraints on both sides of the spectrum. LSST will also have the ability to detect Kilonovae that lack gravitational wave signals which is related to the existence of PBHs.

Very Large Arrays

  • ngVLA- the next generation Very Large Array will be able to improve GW bounds by a magnitude of the current contraints placed by the NANOGrav. This increased sensitivity will be able to confirm the nature of the GW signal from NANOGrav. It will also be able to discriminate a PBH explanation from other sources.

Fast Radio Bursts observatories

MeV Gamma-Ray Telescopes

  • Since the MeV gamma-ray band has yet to be explored, proposed experiments could place tighter constraints on the abundance of PBHs in the asteroid-mass range. Some examples of the proposed telescopes include:
    • AdEPT
    • AMEGO
    • All-Sky ASTROGAM
    • GECCO
    • GRAMS
    • MAST
    • PANGU

GeV and TeV Gamma-Ray Observatories

Difference from direct collapse black holes

A direct collapse black hole is the result of the collapse of unusually dense and large regions of gas, after the radiation-dominated era, while primordial black holes result from the direct collapse of energy, ionized matter, or both, during the inflationary or radiation-dominated eras.[58]

See also

References

  • S.W. Hawking, Commun.Math. Phys. 43 (1975) 199 : Original article proposing existence of radiation
  • D. Page, Phys. Rev. D13 (1976) 198 : First detailed studies of the evaporation mechanism
  • B.J. Carr & S.W. Hawking, Mon. Not. Roy. Astron. Soc 168 (1974) 399 : Describes links between primordial black holes and the early universe
  • A. Barrau et al., Astron. Astrophys. 388 (2002) 676, Astron. Astrophys. 398 (2003) 403, Astrophys. J. 630 (2005) 1015 : Experimental searches for primordial black holes due to the emitted antimatter
  • A. Barrau & G. Boudoul, Review talk given at the International Conference on Theoretical Physics TH2002 : Cosmology with primordial black holes
  • A. Barrau & J. Grain, Phys. Lett. B 584 (2004) 114 : Searches for new physics (quantum gravity) with primordial black holes
  • P. Kanti, Int. J. Mod. Phys. A19 (2004) 4899 : Evaporating black holes and extra-dimensions
  • Bird, Simeon; Albert, Andrea; Dawson, Will; Ali-Haimoud, Ali-Haimoud, Yacine; Coogan, Adam; Drlica-Wagner, Alex; Feng, Qi; Inman, Derek; Inomata, Keisuke; Kovetz, Ely; Kusenko, Alexander; Lehmann, Benjamin V.; Muñoz, Julian B.; Singh, Rajeev; Takhistov, Volodymyr; Tsai, Yu-Dai. 2022. Snowmass2021 Cosmic Frontier White Paper: Primordial Black Hole Dark Matter [57]
  • Inman, Derek; Ali-Haïmoud, Yacine. 2019. Early structure formation in primordial black hole cosmologies. [31]
  • Lincoln, Don. 2022. Is dark matter real? Astronomy’s multi-decade mystery [59]
  • Vaskonen, Ville; Veermäe, Hardi. 2021. Did NANOGrav See a Signal from Primordial Black Hole Formation? [32]
  • Caputo, Andrea. 2019. Radiative axion inflation. [37]
  • Allahverdi, Rouzbeh; Brandenberger, Robert; Cyr-Racine, Francis-Yan; Mazumdar, Anupam. 2010. Reheating in Inflationary Cosmology: Theory and Applications. [38]
  • Mazumdar, Anupam; White Graham. 2019. Review of cosmic phase transitions: their significance and experimental signatures. [39]
  1. ↑ Zel'dovitch & Novikov (14 March 1966). "The Hypothesis of Cores Retarded During Expansion and the Hot Cosmological MOdel". Soviet Astronomy. 10 (4): 602–603. Bibcode:1966AZh....43..758Z.
  2. ↑ Hawking, S (1971). "Gravitationally collapsed objects of very low mass". Mon. Not. R. Astron. Soc. 152: 75. Bibcode:1971MNRAS.152...75H. doi:10.1093/mnras/152.1.75.
  3. 1 2 3 4 Liu, Boyuan; Bromm, Volker (2022-09-27). "Accelerating Early Massive Galaxy Formation with Primordial Black Holes". The Astrophysical Journal Letters. 937 (2): L30. arXiv:2208.13178. Bibcode:2022ApJ...937L..30L. doi:10.3847/2041-8213/ac927f. ISSN 2041-8205. S2CID 252355487.
  4. 1 2 3 4 Yuan, Guan-Wen; Lei, Lei; Wang, Yuan-Zhu; Wang, Bo; Wang, Yi-Ying; Chen, Chao; Shen, Zhao-Qiang; Cai, Yi-Fu; Fan, Yi-Zhong (2023-03-16). "Rapidly growing primordial black holes as seeds of the massive high-redshift JWST Galaxies". arXiv:2303.09391 [astro-ph.CO].
  5. 1 2 3 Frampton, Paul H.; Kawasaki, Masahiro; Takahashi, Fuminobu; Yanagida, Tsutomu T. (22 April 2010). "Primordial Black Holes as All Dark Matter". Journal of Cosmology and Astroparticle Physics. 2010 (4): 023. arXiv:1001.2308. Bibcode:2010JCAP...04..023F. doi:10.1088/1475-7516/2010/04/023. ISSN 1475-7516. S2CID 119256778.
  6. ↑ Villanueva-Domingo, Pablo; Mena, Olga; Palomares-Ruiz, Sergio (2021). "A Brief Review on Primordial Black Holes as Dark Matter". Frontiers in Astronomy and Space Sciences. 8: 87. arXiv:2103.12087. Bibcode:2021FrASS...8...87V. doi:10.3389/fspas.2021.681084. ISSN 2296-987X.
  7. ↑ Green, Anne M; Kavanagh, Bradley J (1 April 2021). "Primordial black holes as a dark matter candidate". Journal of Physics G: Nuclear and Particle Physics. 48 (4): 043001. arXiv:2007.10722. Bibcode:2021JPhG...48d3001G. doi:10.1088/1361-6471/abc534. ISSN 0954-3899. S2CID 220666201. Retrieved 17 August 2023.
  8. 1 2 3 Lacki, Brian C.; Beacom, John F. (12 August 2010). "Primordial Black Holes as Dark Matter: Almost All or Almost Nothing". The Astrophysical Journal. 720 (1): L67–L71. arXiv:1003.3466. Bibcode:2010ApJ...720L..67L. doi:10.1088/2041-8205/720/1/L67. ISSN 2041-8205. S2CID 118418220.
  9. 1 2 3 4 Hütsi, Gert; Raidal, Martti; Urrutia, Juan; Vaskonen, Ville; Veermäe, Hardi (2 February 2023). "Did JWST observe imprints of axion miniclusters or primordial black holes?". Physical Review D. 107 (4): 043502. arXiv:2211.02651. Bibcode:2023PhRvD.107d3502H. doi:10.1103/PhysRevD.107.043502. S2CID 253370365.
  10. 1 2 3 4 Bird, Simeon; Albert, Andrea; Dawson, Will; Ali-Haïmoud, Yacine; Coogan, Adam; Drlica-Wagner, Alex; Feng, Qi; Inman, Derek; Inomata, Keisuke; Kovetz, Ely; Kusenko, Alexander; Lehmann, Benjamin V.; Muñoz, Julian B.; Singh, Rajeev; Takhistov, Volodymyr; Tsai, Yu-Dai (1 August 2023). "Primordial black hole dark matter". Physics of the Dark Universe. 41: 101231. arXiv:2203.08967. Bibcode:2023PDU....4101231B. doi:10.1016/j.dark.2023.101231. ISSN 2212-6864. S2CID 247518939.
  11. 1 2 3 Espinosa, J. R.; Racco, D.; Riotto, A. (23 March 2018). "A Cosmological Signature of the Standard Model Higgs Vacuum Instability: Primordial Black Holes as Dark Matter". Physical Review Letters. 120 (12): 121301. arXiv:1710.11196. Bibcode:2018PhRvL.120l1301E. doi:10.1103/PhysRevLett.120.121301. PMID 29694085. S2CID 206309027.
  12. 1 2 3 Clesse, Sebastien; García-Bellido, Juan (2018). "Seven Hints for Primordial Black Hole Dark Matter". Physics of the Dark Universe. 22: 137–146. arXiv:1711.10458. Bibcode:2018PDU....22..137C. doi:10.1016/j.dark.2018.08.004. S2CID 54594536.
  13. 1 2 3 Kashlinsky, A. (23 May 2016). "LIGO gravitational wave detection, primordial black holes and the near-IR cosmic infrared background anisotropies". The Astrophysical Journal. 823 (2): L25. arXiv:1605.04023. Bibcode:2016ApJ...823L..25K. doi:10.3847/2041-8205/823/2/L25. ISSN 2041-8213. S2CID 118491150.
  14. ↑ Carr, B.J.; Hawking, S.W. (2004). "Black holes in the early Universe". Monthly Notices of the Royal Astronomical Society. 168 (2): 399–416. arXiv:astro-ph/0407207. Bibcode:1974MNRAS.168..399C. doi:10.1093/mnras/168.2.399.
  15. ↑ del Barco, Oscar (2021). "Primordial black hole origin for thermal gamma-ray bursts". Monthly Notices of the Royal Astronomical Society. 506 (1): 806–812. arXiv:2007.11226. Bibcode:2021MNRAS.506..806B. doi:10.1093/mnras/stab1747.
  16. ↑ Overduin, J. M.; Wesson, P. S. (November 2004). "Dark Matter and Background Light". Physics Reports. 402 (5–6): 267–406. arXiv:astro-ph/0407207. Bibcode:2004PhR...402..267O. doi:10.1016/j.physrep.2004.07.006. S2CID 1634052.
  17. ↑ Clesse, S.; Garcia-Bellido, J. (2015). "Massive Primordial Black Holes from Hybrid Inflation as Dark Matter and the seeds of Galaxies". Physical Review D. 92 (2): 023524. arXiv:1501.07565. Bibcode:2015PhRvD..92b3524C. doi:10.1103/PhysRevD.92.023524. hdl:10486/674729. S2CID 118672317.
  18. ↑ Sokol, Joshua (2020-09-23). "Physicists Argue That Black Holes From the Big Bang Could Be the Dark Matter". Quanta Magazine. Retrieved 2021-09-06.
  19. ↑ Ali-Haïmoud, Yacine; Kovetz, Ely D.; Kamionkowski, Marc (2017-12-19). "The merger rate of primordial-black-hole binaries". Physical Review D. 96 (12): 123523. arXiv:1709.06576. Bibcode:2017PhRvD..96l3523A. doi:10.1103/PhysRevD.96.123523. ISSN 2470-0010. S2CID 119419981.
  20. ↑ Jedamzik, Karsten (2020-09-14). "Primordial Black Hole Dark Matter and the LIGO/Virgo observations". Journal of Cosmology and Astroparticle Physics. 2020 (9): 022. arXiv:2006.11172. Bibcode:2020JCAP...09..022J. doi:10.1088/1475-7516/2020/09/022. ISSN 1475-7516. S2CID 219956276.
  21. ↑ Jedamzik, Karsten (September 2020). "Primordial black hole dark matter and the LIGO/Virgo observations". Journal of Cosmology and Astroparticle Physics. 2020 (9): 022. arXiv:2006.11172. Bibcode:2020JCAP...09..022J. doi:10.1088/1475-7516/2020/09/022. ISSN 1475-7516. S2CID 219956276.
  22. ↑ Bird, S.; Cholis, I. (2016). "Did LIGO Detect Dark Matter?". Physical Review Letters. 116 (20): 201301. arXiv:1603.00464. Bibcode:2016PhRvL.116t1301B. doi:10.1103/PhysRevLett.116.201301. PMID 27258861. S2CID 23710177.
  23. 1 2 Clesse, S.; Garcia-Bellido, J. (2017). "The clustering of massive Primordial Black Holes as Dark Matter: Measuring their mass distribution with Advanced LIGO". Physics of the Dark Universe. 10 (2016): 142–147. arXiv:1603.05234. Bibcode:2017PDU....15..142C. doi:10.1016/j.dark.2016.10.002. S2CID 119201581.
  24. ↑ Sasaki, M.; Suyama, T.; Tanaki, T. (2016). "Primordial Black Hole Scenario for the Gravitational-Wave Event GW150914". Physical Review Letters. 117 (6): 061101. arXiv:1603.08338. Bibcode:2016PhRvL.117f1101S. doi:10.1103/PhysRevLett.117.061101. PMID 27541453. S2CID 7362051.
  25. ↑ "Did Gravitational Wave Detector Find Dark Matter?". Johns Hopkins University. June 15, 2016. Retrieved June 20, 2015.
  26. ↑ Khalouei, E.; Ghodsi, H.; Rahvar, S.; Abedi, J. (2021-04-02). "Possibility of primordial black holes as the source of gravitational wave events in the advanced LIGO detector". Physical Review D. 103 (8): 084001. arXiv:2011.02772. Bibcode:2021PhRvD.103h4001K. doi:10.1103/PhysRevD.103.084001. S2CID 226254110.
  27. ↑ Kashlinsky, A. (2016). "LIGO gravitational wave detection, primordial black holes and the near-IR cosmic infrared background anisotropies". The Astrophysical Journal. 823 (2): L25. arXiv:1605.04023. Bibcode:2016ApJ...823L..25K. doi:10.3847/2041-8205/823/2/L25. S2CID 118491150.
  28. ↑ Montero-Camacho, Paulo; Fang, Xiao; Vasquez, Gabriel; Silva, Makana; Hirata, Christopher M. (2019-08-23). "Revisiting constraints on asteroid-mass primordial black holes as dark matter candidates". Journal of Cosmology and Astroparticle Physics. 2019 (8): 031. arXiv:1906.05950. Bibcode:2019JCAP...08..031M. doi:10.1088/1475-7516/2019/08/031. ISSN 1475-7516. S2CID 189897766.
  29. ↑ Scholtz, J.; Unwin, J. (2019). What if Planet 9 is a Primordial Black Hole?. High Energy Physics - Phenomenology (Report). arXiv:1909.11090.
  30. ↑ Anderson, D.; Hunt, B. (5 December 2019). "Why astrophysicists think there's a black hole in our solar system". Business Insider. Retrieved 7 December 2019.
  31. 1 2 Inman, Derek; Ali-Haïmoud, Yacine (2019-10-17). "Early structure formation in primordial black hole cosmologies". Physical Review D. 100 (8): 2–19. arXiv:1907.08129. Bibcode:2019PhRvD.100h3528I. doi:10.1103/PhysRevD.100.083528. S2CID 197544796.
  32. 1 2 Vaskonen, Ville; Veermäe, Hardi (2021-02-05). "Did NANOGrav See a Signal from Primordial Black Hole Formation?". Physical Review Letters. 126 (5): 051303. arXiv:2009.07832. Bibcode:2021PhRvL.126e1303V. doi:10.1103/PhysRevLett.126.051303. PMID 33605761. S2CID 221738943.
  33. ↑ Overbye, Dennis (24 December 2023). "How to Create a Black Hole Out of Thin Air - Black holes were thought to arise from the collapse of dead stars. But a Webb telescope image showing the early universe hints at an alternative pathway". The New York Times. Archived from the original on 25 December 2023. Retrieved 26 December 2023.
  34. ↑ Natarajan, Priyamvada; et al. (26 November 2023). "First Detection of an Over-Massive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse". arXiv:2308.02654. {{cite journal}}: Cite journal requires |journal= (help)
  35. ↑ Kawasaki, Masahiro; Kitajima, Naoya; Yanagida, Tsutomu T. (2013-03-18). "Primordial black hole formation from an axionlike curvaton model". Physical Review D. 87 (6): 063519. arXiv:1207.2550. Bibcode:2013PhRvD..87f3519K. doi:10.1103/PhysRevD.87.063519. S2CID 119230374.
  36. ↑ Harada, T.; Yoo, C.-M.; Khori, K. (2013). "Threshold of primordial black hole formation". Physical Review D. 88 (8): 084051. arXiv:1309.4201. Bibcode:2013PhRvD..88h4051H. doi:10.1103/PhysRevD.88.084051. S2CID 119305036.
  37. 1 2 Caputo, Andrea (2019-10-10). "Radiative axion inflation". Physics Letters B. 797: 134824. arXiv:1902.02666. Bibcode:2019PhLB..79734824C. doi:10.1016/j.physletb.2019.134824. ISSN 0370-2693. S2CID 119263320.
  38. 1 2 Allahverdi, Rouzbeh (2010-05-28). "Reheating in Inflationary Cosmology: Theory and Applications". Annual Review of Nuclear and Particle Science. 60: 27–51. arXiv:1001.2600. Bibcode:2010ARNPS..60...27A. doi:10.1146/annurev.nucl.012809.104511. S2CID 59384028.
  39. 1 2 Mazumdar, Anupam; White, Graham (2019-06-25). "Review of cosmic phase transitions: their significance and experimental signatures". Reports on Progress in Physics. 82 (7): 076901. arXiv:1811.01948. Bibcode:2019RPPh...82g6901M. doi:10.1088/1361-6633/ab1f55. ISSN 0034-4885. PMID 31051483. S2CID 145022768.
  40. ↑ Carr, Bernard; Kühnel, Florian (2 May 2022). "Primordial black holes as dark matter candidates". SciPost Physics Lecture Notes: 48. arXiv:2110.02821. doi:10.21468/SciPostPhysLectNotes.48. S2CID 238407875. Retrieved 13 February 2023. (See also the accompanying slide presentation.
  41. ↑ Carneiro, S.; de Holanda, P.C.; Saa, A. (2021). "Neutrino primordial Planckian black holes". Physics Letters. B822: 136670. Bibcode:2021PhLB..82236670C. doi:10.1016/j.physletb.2021.136670. ISSN 0370-2693. S2CID 244196281.
  42. ↑ D. Stojkovic; K. Freese & G. D. Starkman (2005). "Holes in the walls: primordial black holes as a solution to the cosmological domain wall problem". Phys. Rev. D. 72 (4): 045012. arXiv:hep-ph/0505026. Bibcode:2005PhRvD..72d5012S. doi:10.1103/PhysRevD.72.045012. S2CID 51571886.
  43. ↑ D. Stojkovic; K. Freese (2005). "A black hole solution to the cosmological monopole problem". Phys. Lett. B. 606 (3–4): 251–257. arXiv:hep-ph/0403248. Bibcode:2005PhLB..606..251S. doi:10.1016/j.physletb.2004.12.019. S2CID 119401636.
  44. ↑ McKee, Maggie. (2006) NewScientistSpace.com – Satellite could open door on extra dimension
  45. ↑ Hawking, S.W. (1977). "The quantum mechanics of black holes". Scientific American. 236: 34–40. Bibcode:1977SciAm.236a..34H. doi:10.1038/scientificamerican0177-34.
  46. ↑ Ali-Haimoud, Y.; Kamionkowski, M. (2017). "Cosmic microwave background limits on accreting primordial black holes". Physical Review D. 95 (4): 043534. arXiv:1612.05644. Bibcode:2017PhRvD..95d3534A. doi:10.1103/PhysRevD.95.043534. S2CID 119483868.
  47. ↑ Eroshenko, Yuri (2016). "Dark Matter Density Spikes around Primordial Black Holes". Astronomy Letters. 42 (6): 347–356. arXiv:1607.00612. Bibcode:2016AstL...42..347E. doi:10.1134/S1063773716060013. S2CID 118477620.
  48. ↑ Boucenna, Sofiane M.; Kühnel, Florian; Ohlsson, Tommy; Visinelli, Luca (2018). "Novel Constraints on Mixed Dark-Matter Scenarios of Primordial Black Holes and WIMPs". Journal of Cosmology and Astroparticle Physics. 1807 (7): 003. arXiv:1712.06383. Bibcode:2018JCAP...07..003B. doi:10.1088/1475-7516/2018/07/003. S2CID 119402552.
  49. ↑ Tashiro, H.; Sugiyama, N. (2012). "The effect of primordial black holes on 21 cm fluctuations". Monthly Notices of the Royal Astronomical Society. 435 (4): 3001. arXiv:1207.6405. Bibcode:2013MNRAS.435.3001T. doi:10.1093/mnras/stt1493. S2CID 118560597.
  50. ↑ Cholis, I.; Kovetz, E.D.; Ali-Haimoud, Y.; Bird, S.; Kamionkowski, M.; Munoz, J.; Raccanelli, A. (2016). "Orbital eccentricities in primordial black hole binaries". Physical Review D. 94 (8): 084013. arXiv:1606.07437. Bibcode:2016PhRvD..94h4013C. doi:10.1103/PhysRevD.94.084013. S2CID 119236439.
  51. ↑ Clesse, Sebastien; Garcia-Bellido, Juan (2016). "Detecting the gravitational wave background from primordial black hole dark matter". Physics of the Dark Universe. 18: 105–114. arXiv:1610.08479. Bibcode:2017PDU....18..105C. doi:10.1016/j.dark.2017.10.001. S2CID 73589635.
  52. ↑ Khriplovich, I. B.; Pomeransky, A. A.; Produit, N.; Ruban, G. Yu. (2008). "Can one detect passage of a small black hole through the Earth?". Physical Review D. 77 (6): 064017. arXiv:0710.3438. Bibcode:2008PhRvD..77f4017K. doi:10.1103/PhysRevD.77.064017. S2CID 118604599.
  53. ↑ Khriplovich, I. B.; Pomeransky, A. A.; Produit, N.; Ruban, G. Yu. (2008). "Passage of small black hole through the Earth. Is it detectable?". arXiv:0801.4623 [hep-ex].
  54. ↑ "Primitive Black Holes Could Shine". Space.com. 26 September 2011.
  55. ↑ Kesden, Michael; Hanasoge, Shravan (2011). "Transient Solar Oscillations Driven by Primordial Black Holes". Physical Review Letters. 107 (11): 111101. arXiv:1106.0011. Bibcode:2011PhRvL.107k1101K. doi:10.1103/PhysRevLett.107.111101. PMID 22026654. S2CID 20800215.
  56. ↑ Naderi, Tayebeh; Mehrabi, Ahmad; Rahvar, Sohrab (2018). "Primordial black hole detection through diffractive microlensing". Physical Review D. 97 (10): 103507. arXiv:1711.06312. Bibcode:2018PhRvD..97j3507N. doi:10.1103/PhysRevD.97.103507. S2CID 118889277.
  57. 1 2 Bird, Simeon; Albert, Andrea; Dawson, Will; Ali-Haimoud, Yacine; Coogan, Adam; Drlica-Wagner, Alex; Feng, Qi; Inman, Derek; Inomata, Keisuke; Kovetz, Ely; Kusenko, Alexander; Lehmann, Benjamin V.; Munoz, Julian B.; Singh, Rajeev; Takhistov, Volodymyr; Tsai, Yu-Dai (2023). "Snowmass2021 Cosmic Frontier White Paper: Primordial black hole dark matter". Physics of the Dark Universe. 41: 101231. arXiv:2203.08967. Bibcode:2023PDU....4101231B. doi:10.1016/j.dark.2023.101231. S2CID 247518939.
  58. ↑ Carr, Bernard; Kühnel, Florian (19 October 2020). "Primordial Black Holes as Dark Matter: Recent Developments". Annual Review of Nuclear and Particle Science. 70 (1): 355–394. arXiv:2006.02838. Bibcode:2020ARNPS..70..355C. doi:10.1146/annurev-nucl-050520-125911. ISSN 0163-8998. S2CID 118475595. Retrieved 4 September 2023.
  59. ↑ Lincoln, Don (2022-08-13). "Is dark matter real? Astronomy's multi-decade mystery". Big Think. Retrieved 2023-02-20.
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