Forming supermassive black holes like J1342+0928 (invoking dark matter) in early universe

2018 ◽  
Vol 363 (2) ◽  
Author(s):  
C. Sivaram ◽  
Arun Kenath ◽  
O. V. Kiren
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Early Universe ◽  
Supermassive Black Holes

scholarly journals Accretion disc luminosity for black holes surrounded by dark matter

2020 ◽  
Vol 496 (2) ◽  
pp. 1115-1123
Author(s):  
K Boshkayev ◽  
A Idrissov ◽  
O Luongo ◽  
D Malafarina
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Refractive Index ◽  
Dark Matter ◽  
Early Universe ◽  
Space Time ◽  
Supermassive Black Holes ◽  
Accretion Disc ◽  
Mass Estimation ◽  
Static Black Hole

ABSTRACT We consider the observational properties of a static black hole space–time immersed in a dark matter envelope. We investigate how the modifications to geometry induced by the presence of dark matter affect the luminosity of the black hole’s accretion disc. We show that the same disc luminosity as produced by a black hole in vacuum may be produced by a smaller black hole surrounded by dark matter under certain conditions. In particular, we demonstrate that the luminosity of the disc is markedly altered by the presence of dark matter, suggesting that the mass estimation of distant supermassive black holes may be changed if they are immersed in dark matter. We argue that a similar effect holds in more realistic scenarios, and we discuss the refractive index related to dark matter lensing. Finally, we show how the results presented here may help to explain the observed luminosity of supermassive black holes in the early Universe.

scholarly journals Supermassive black holes surrounded by dark matter modeled as anisotropic fluid: epicyclic oscillations and their fitting to observed QPOs

2021 ◽  
Vol 2021 (11) ◽  
pp. 059
Author(s):  
Z. Stuchlík ◽  
J. Vrba
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Supermassive Black Holes ◽  
Anisotropic Fluid ◽  
Physical Parameters ◽  
Black Hole Spacetimes ◽  
Test Particles

Abstract Recently introduced exact solution of the Einstein gravity coupled minimally to an anisotropic fluid representing dark matter can well represent supermassive black holes in galactic nuclei with realistic distribution of dark matter around the black hole, given by the Hernquist-like density distribution. For these fluid-hairy black hole spacetimes, properties of the gravitational radiation, quasinormal ringing, and optical phenomena were studied, giving interesting results. Here, using the range of physical parameters of these spacetimes allowing for their relevance in astrophysics, we study the epicyclic oscillatory motion of test particles in these spacetimes. The frequencies of the orbital and epicyclic motion are applied in the epicyclic resonance variant of the geodesic model of quasiperiodic oscillations (QPOs) observed in active galactic nuclei to demonstrate the possibility to solve the cases where the standard vacuum black hole spacetimes are not allowing for explanation of the observed data. We demonstrate that the geodesic model can explain the QPOs observed in most of the active galactic nuclei for the fluid-hairy black holes with reasonable halo parameters.

scholarly journals Supermassive black holes in the early universe

2019 ◽  
Vol 60 (2) ◽  
pp. 111-126 ◽  
Author(s):  
Aaron Smith ◽  
Volker Bromm
Keyword(s):  
Black Holes ◽  
Early Universe ◽  
Supermassive Black Holes

scholarly journals The M-sigma relation of supermassive black holes from the scalar field dark matter

2020 ◽  
Vol 35 (19) ◽  
pp. 2050155
Author(s):  
Jae-Weon Lee ◽  
Hyeong-Chan Kim ◽  
Jungjai Lee
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Scalar Field ◽  
Numerical Study ◽  
Dark Matter Particle ◽  
Einstein Condensate ◽  
Supermassive Black Holes ◽  
Dark Matter Halo ◽  
Wave Nature ◽  
Velocity Dispersions

We show a relation between the mass of supermassive black holes in galaxies and the velocity dispersions of their bulges in the scalar field or the Bose–Einstein condensate dark matter model. The gravity of the central black holes changes boundary conditions of the scalar field at the galactic centers. Owing to the wave nature of the dark matter, this significantly changes the galactic dark matter halo profiles even though the black holes are much lighter than the bulges. As a result the heavier the black holes are, the more compact the bulges are, and hence the larger the velocity dispersions are. This tendency is verified by a numerical study showing the M-sigma relation reproduced with the dark matter particle mass [Formula: see text] eV.

scholarly journals Titans of the early Universe: The Prato statement on the origin of the first supermassive black holes

2019 ◽  
Vol 36 ◽  
Author(s):  
Tyrone E. Woods ◽  
Bhaskar Agarwal ◽  
Volker Bromm ◽  
Andrew Bunker ◽  
Ke-Jung Chen ◽  
...  
Keyword(s):  
Black Holes ◽  
Early Universe ◽  
Supermassive Black Holes ◽  
Considerable Progress ◽  
Next Generation ◽  
Theoretical Understanding ◽  
Theoretical Evidence ◽  
Present Understanding ◽  
Insight Into ◽  
Made In

Abstract In recent years, the discovery of massive quasars at $z\sim7$ has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early Universe. Mounting observational and theoretical evidence indicates the viability of massive seeds, formed by the collapse of supermassive stars, as a progenitor model for such early, massive accreting black holes. Although considerable progress has been made in our theoretical understanding, many questions remain regarding how (and how often) such objects may form, how they live and die, and how next generation observatories may yield new insight into the origin of these primordial titans. This review focusses on our present understanding of this remarkable formation scenario, based on the discussions held at the Monash Prato Centre from November 20 to 24, 2017, during the workshop ‘Titans of the Early Universe: The Origin of the First Supermassive Black Holes’.

scholarly journals Dark matter accretion into supermassive black holes

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
Sébastien Peirani ◽  
J. A. de Freitas Pacheco
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Supermassive Black Holes
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