Accelerating early massive galaxy formation with primordial black holes

Liu, Boyuan

doi:10.48550/arxiv.2208.13178

Cited by 3 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the BHU model, large PBHs could instead be the seeds to form massive galaxies, which together with smaller PBHs and NSs could be the mysterious DM. This could also help explain some recent JWST observations of high redshift massive galaxies [50,51] and the puzzling observation of very luminous quasars (which trace supermassive BHs) at very high redshift (see [52] and references there in). Smaller BHs could be present as a dormant population, which could be detected with GAIA measuremnts [53].…”

Section: Conclusion and Discussionmentioning

confidence: 74%

The Black Hole Universe, Part II

Gaztañaga

2022

Symmetry

View full text Add to dashboard Cite

In part I of this series, we showed that the observed Universe can be modeled as a local Black Hole of fixed mass M≃6×1022M⊙, without Dark Energy: cosmic acceleration is caused by the Black Hole event horizon rS = 2GM. Here, we propose that such Black Hole Universe (together with smaller primordial Black Holes) could form from the hierarchical free-fall collapse of regular matter. We argue that the singularity could be avoided with a Big Bounce explosion, which results from neutron degeneracy pressure (Pauli exclusion principle). This happens at GeV energies, like in core collapse supernova, well before the collapse reaches Planck energies (1019 GeV). If our Universe formed this way, there is no need for Cosmic Inflation or a singular start (the Big Bang). Nucleosynthesis and recombination follow a hot expansion, as in the standard model, but cosmological measurements (which are free parameters in the standard model) could in principle be predicted from first principles. Part or all of the Dark Matter could be made up of primordial compact objects (Black Holes and Neutron Stars), remnants of the collapse and bounce. This can provide a faster start for galaxy formation. We present a simple prediction to explain the observed value of M≃6×1022M⊙ or equivalently ΩΛ (the fraction of the critical energy density observed today in form of Dark Energy) and the coincidence problem Ωm∼ΩΛ.

show abstract

Section: Conclusion and Discussionmentioning

confidence: 74%

The Black Hole Universe, Part II

Gaztañaga

2022

Symmetry

View full text Add to dashboard Cite

show abstract

“…As is stated in ref. [18], the recent observations with JWST have identified several bright galaxy candidates at 𝑧 10, some of which appear unusually massive (up to ∼ 10 11 M ). Such early formation of massive galaxies is difficult to reconcile with standard ΛCDM predictions demanding very high star formation efficiency (SFE), possibly even in excess of the cosmic baryon mass budget in collapsed structures.…”

Section: Seeding Of Early Galaxiesmentioning

confidence: 99%

JWST data and possible interpretation

Dolgov

2024

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources XIV — PoS(MULTIF2023)

View full text Add to dashboard Cite

Recent data released by James Webb Space Telescope (JWST) and, somewhat earlier, the data presented by Hubble Space Telescope (HST) are commonly understood as a strong indication for breaking of the canonical ΛCDM cosmology. It is argued in the presented work that massive primordial black holes (PBH) could seed galaxy and quasar formation in the very young universe as it has been conjectured in our paper of 1993 and resolve the tension induced by the JWST and the HST data with the standard cosmology. This point of view is presently supported by several recent works. The proposed mechanism of PBH formation leads to the log-normal mass spectrum of PBHs and predicts abundant antimatter population of our Galaxy, Milky Way. Both these predictions are in excellent agreement with astronomical observations.

show abstract

“…To ease this tension with the observations, a plethora of cosmological and astrophysical hypotheses were proposed. These ranged from seeking possible modifications to the baseline ΛCDM cosmology [59][60][61][62][63][64][65] to invoking various astrophysical factors like boosted efficiency of star formation [66][67][68], stochasticity in the star-formation activity [54,69,70], the presence of Pop-III stars with a top-heavy initial mass function [49,71] and negligible dust attenuation beyond z ≳ 11 [72]. However, as these high-z JWST surveys observed a relatively small volume of the sky, the possibility that their measured UVLFs may have been greatly affected by the effects of cosmic variance [73,74], besides other survey systematics, cannot be ignored either.…”

Section: Jcap07(2024)078mentioning

confidence: 99%

Modelling the star-formation activity and ionizing properties of high-redshift galaxies

Chakraborty,

Choudhury

2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Early results from the JWST observations have reported a surprisingly high number of UV-bright galaxies at z ≥ 10, which appears to challenge the theoretical predictions from standard galaxy formation models in the ΛCDM framework at these redshifts. To alleviate this tension, several cosmological and astrophysical interpretations have been advanced. However, all of these proposed scenarios carry noteworthy consequences for other large-scale processes in the early Universe, particularly cosmic reionization, since high-redshift galaxies are believed to be the primary ionizing sources during the Epoch of Reionization (EoR). To investigate this, we introduce a semi-analytical model of galaxy formation and evolution that explains the evolving galaxy UV luminosity function (UVLF) over 6 ≲ z ≲ 15, and also jointly tracks the time evolution of the globally averaged neutral hydrogen fraction in the intergalactic medium. The model self-consistently accounts for the suppression of star formation in low-mass galaxies due to reionization feedback and is constrained by comparing the model predictions with various observational probes like the UVLF data from HST and JWST, recent measurements of the neutral hydrogen fraction, and the CMB scattering optical depth. Our analysis confirms that a rapid enhancement in the star-formation rate efficiency and/or UV luminosity per stellar mass formed is necessary for consistency with the JWST UVLF estimates at z ≥ 10. We further find that it is possible to jointly satisfy the current reionization constraints when the escape fraction is assumed to be halo-mass dependent, requiring higher Lyman-continuum leakage from low-mass galaxies. We also examine the relative contribution of galaxies with different UV luminosities towards the ionizing photon budget for the EoR and investigate the large-scale bias of high-z galaxies.

show abstract

Accelerating early massive galaxy formation with primordial black holes

Cited by 3 publications

References 50 publications

The Black Hole Universe, Part II

The Black Hole Universe, Part II

JWST data and possible interpretation

Modelling the star-formation activity and ionizing properties of high-redshift galaxies

Contact Info

Product

Resources

About