scholarly journals Advances in Black Hole Gravitational Physics and Cold Dark Matter Modelling. The Gravity of Dark Matter

2011 ◽  
Vol 4 (1) ◽  
pp. 6-13 ◽  
Author(s):  
A. Worsley
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter

scholarly journals Primordial Black Holes as Dark Matter: Recent Developments

2020 ◽  
Vol 70 (1) ◽  
pp. 355-394 ◽  
Author(s):  
Bernard Carr ◽  
Florian Kühnel
Keyword(s):  
Elementary Particle ◽  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Galactic Nuclei ◽  
Matter Density ◽  
Primordial Black Holes ◽  
Poisson Effect ◽  
Recent Developments

Although the dark matter is usually assumed to be made up of some form of elementary particle, primordial black holes (PBHs) could also provide some of it. However, various constraints restrict the possible mass windows to 1016–1017 g, 1020–1024 g, and 10–103 M⊙. The last possibility is contentious but of special interest in view of the recent detection of black hole mergers by LIGO/Virgo. PBHs might have important consequences and resolve various cosmological conundra even if they account for only a small fraction of the dark matter density. In particular, those larger than 103 M⊙ could generate cosmological structures through the seed or Poisson effect, thereby alleviating some problems associated with the standard cold dark matter scenario, and sufficiently large PBHs might provide seeds for the supermassive black holes in galactic nuclei. More exotically, the Planck-mass relics of PBH evaporations or stupendously large black holes bigger than 1012 M⊙ could provide an interesting dark component.

scholarly journals Non-cold dark matter from primordial black hole evaporation

2020 ◽  
Vol 2020 (08) ◽  
pp. 045-045 ◽  
Author(s):  
Iason Baldes ◽  
Quentin Decant ◽  
Deanna C. Hooper ◽  
Laura Lopez-Honorez
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Primordial Black Hole ◽  
Black Hole Evaporation

scholarly journals Primordial black holes and the origin of the matter–antimatter asymmetry

2019 ◽  
Vol 377 (2161) ◽  
pp. 20190091 ◽  
Author(s):  
Juan García-Bellido
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Hot Spot ◽  
Large Mass ◽  
New Physics ◽  
Primordial Black Holes ◽  
Far From Equilibrium ◽  
The Universe

We review here a new scenario of hot spot electroweak baryogenesis where the local energy released in the gravitational collapse to form primordial black holes (PBHs) at the quark-hadron (QCD) epoch drives over-the-barrier sphaleron transitions in a far from equilibrium environment with just the standard model CP violation. Baryons are efficiently produced in relativistic collisions around the black holes and soon redistribute to the rest of the universe, generating the observed matter–antimatter asymmetry well before primordial nucleosynthesis. Therefore, in this scenario there is a common origin of both the dark matter to baryon ratio and the photon to baryon ratio. Moreover, the sudden drop in radiation pressure of relativistic matter at H 0 / W ± / Z 0 decoupling, the QCD transition and e + e − annihilation enhances the probability of PBH formation, inducing a multi-modal broad mass distribution with characteristic peaks at 10 −6 , 1, 30 and 10 6   M ⊙ , rapidly falling at smaller and larger masses, which may explain the LIGO–Virgo black hole mergers as well as the OGLE-GAIA microlensing events, while constituting all of the cold dark matter today. We predict the future detection of binary black hole (BBH) mergers in LIGO with masses between 1 and 5  M ⊙ , as well as above 80  M ⊙ , with very large mass ratios. Next generation gravitational wave and microlensing experiments will be able to test this scenario thoroughly. This article is part of a discussion meeting issue ‘Topological avatars of new physics’.

scholarly journals J1342+0928 supports the timeline in the Rh = ct cosmology

2018 ◽  
Vol 615 ◽  
pp. A113 ◽  
Author(s):  
Fulvio Melia
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Big Bang ◽  
High Mass ◽  
Local Universe ◽  
Time Compression ◽  
The Standard Model ◽  
Accretion Rates ◽  
The Big Bang

Aims. The discovery of quasar J1342+0928 (z = 7.54) reinforces the time compression problem associated with the premature formation of structure in Λ cold dark matter (ΛCDM). Adopting the Planck parameters, we see this quasar barely 690 Myr after the big bang, no more than several hundred Myr after the transition from Pop III to Pop II star formation. Yet conventional astrophysics would tell us that a 10 M⊙ seed, created by a Pop II/III supernova, should have taken at least 820 Myr to grow via Eddington-limited accretion. This failure by ΛCDM constitutes one of its most serious challenges, requiring exotic “fixes”, such as anomalously high accretion rates, or the creation of enormously massive (~ 105 M⊙) seeds, neither of which is ever seen in the local Universe, or anywhere else for that matter. Indeed, to emphasize this point, J1342+0928 is seen to be accreting at about the Eddington rate, negating any attempt at explaining its unusually high mass due to such exotic means. In this paper, we aim to demonstrate that the discovery of this quasar instead strongly confirms the cosmological timeline predicted by the Rh = ct Universe. Methods. We assume conventional Eddington-limited accretion and the time versus redshift relation in this model to calculate when a seed needed to start growing as a function of its mass in order to reach the observed mass of J1342+0928 at z = 7.54. Results. Contrary to the tension created in the standard model by the appearance of this massive quasar so early in its history, we find that in the Rh = ct cosmology, a 10 M⊙ seed at z ~ 15 (the start of the Epoch of Reionization at t ~ 878 Myr) would have easily grown into an 8 × 108 M⊙ black hole at z = 7.54 (t ~ 1.65 Gyr) via conventional Eddington-limited accretion.

scholarly journals Self-interacting dark matter and the delay of supermassive black hole growth

2020 ◽  
Vol 500 (2) ◽  
pp. 2177-2187 ◽  
Author(s):  
A Cruz ◽  
A Pontzen ◽  
M Volonteri ◽  
T R Quinn ◽  
M Tremmel ◽  
...  
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Galaxy Evolution ◽  
Cold Dark Matter ◽  
Host Galaxies ◽  
Supermassive Black Hole ◽  
Black Hole Growth ◽  
History Of ◽  
Hole Growth ◽  
Delayed Growth

ABSTRACT Using cosmological hydrodynamic simulations with physically motivated models of supermassive black hole (SMBH) formation and growth, we compare the assembly of Milky Way-mass (Mvir ≈ 7 × 1011 M⊙ at z = 0) galaxies in cold dark matter (CDM) and self-interacting dark matter (SIDM) models. Our SIDM model adopts a constant cross-section of 1 cm2 g−1. We find that SMBH formation is suppressed in the early Universe due to SIDM interactions. SMBH–SMBH mergers are also suppressed in SIDM as a consequence of the lower number of SMBHs formed. Lack of initial merger-driven SMBH growth in turn delays SMBH growth by billions of years in SIDM compared to CDM. Further, we find that this delayed growth suppresses SMBH accretion in the largest progenitors of the main SIDM galaxies during the first 5 Gyr of their evolution. Nonetheless, by z = 0.8 the CDM and SIDM SMBH masses differ only by around 0.2 dex, so that both remain compatible with the MBH–M* relation. We show that the reduced accretion causes the SIDM SMBHs to less aggressively regulate star formation in their host galaxies than their CDM counterparts, resulting in a factor of 3 or more stars being produced over the lifetime of the SIDM galaxies compared to the CDM galaxies. Our results highlight a new way in which SIDM can affect the growth and merger history of SMBHs and ultimately give rise to very different galaxy evolution compared to the classic CDM model.

scholarly journals Black hole spin and radio loudness in a Λ cold dark matter universe

2009 ◽  
Vol 395 (2) ◽  
pp. 625-636 ◽  
Author(s):  
Claudia del P. Lagos ◽  
Nelson D. Padilla ◽  
Sofía A. Cora
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Black Hole Spin

Influence of dark matter on phase transitions of XCDM black hole in braneworld based on the framework of GUP

2020 ◽  
pp. 2150011
Author(s):  
Xiang Liu ◽  
Hui-Ling Li ◽  
Liu Li
Keyword(s):  
Phase Transition ◽  
Black Hole ◽  
Dark Matter ◽  
Phase Transitions ◽  
Cold Dark Matter ◽  
Generalized Uncertainty Principle ◽  
Local Temperature ◽  
Tunneling Radiation ◽  
First Order Phase Transition ◽  
First Order Phase

In this paper, under the framework of generalized uncertainty principle (GUP), based on the quantum tunneling radiation, we discuss the influence of dark matter on thermodynamics and phase transition from the X-cold dark matter (XCDM) black hole in Braneworld. It turns out that the existence of the dark matter can give rise to some new relations such as local temperature–mass, heat capacity–mass and local free energy–local temperature, and dark matter can play an important role in phase transitions. It is worth emphasizing that the first-order phase transition, second-order and Hawking–Page-like phase transitions can be observed from the new phase diagrams, and the novel and interesting thermodynamics behavior has been presented under the influence of GUP and dark matter.

Black Hole Growth and Activity in a Λ Cold Dark Matter Universe

2003 ◽  
Vol 593 (1) ◽  
pp. 56-68 ◽  
Author(s):  
Tiziana Di Matteo ◽  
Rupert A. C. Croft ◽  
Volker Springel ◽  
Lars Hernquist
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Cold Dark Matter ◽  
Black Hole Growth ◽  
Hole Growth

scholarly journals Black Hole Feeding and Feedback in the Context of Galaxy Formation

2009 ◽  
Vol 5 (S267) ◽  
pp. 411-420
Author(s):  
Rachel S. Somerville
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
State Of The Art ◽  
Supermassive Black Holes ◽  
Cosmological Simulations ◽  
Evolution Of Galaxies ◽  
The Impact

AbstractI describe ways in which state-of-the-art cosmological simulations are modeling the growth and evolution of supermassive black holes (feeding), and the impact of the energy that they release on galaxies and their surroundings (feedback). I then discuss how this new picture of interconnected co-evolution of galaxies and black holes provides plausible explanations for several of the mysteries that have long vexed theorists studying galaxy formation within the hierarchical cold dark matter paradigm.

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