Investigating strong gravitational lensing effects by supermassive black holes with Horndeski gravity [PDF]
European Physical Journal C: Particles and Fields, 2022 We study gravitational lensing in strong-field limit by a static spherically symmetric black hole in quartic scalar field Horndeski gravity having additional hair parameter q, evading the no-hair theorem.
Jitendra Kumar +2 more
doaj +2 more sources
Searching for ultra-light bosons and constraining black hole spin distributions with stellar tidal disruption events [PDF]
Nature Communications, 2022 Stellar tidal disruption events (TDEs) occur when stars pass close enough to supermassive black holes. Here, the authors show that future searches TDEs have potential to uncover the existence of ultralight bosons.
Peizhi Du +4 more
doaj +2 more sources
Signals of merging supermassive black holes in pulsar timing arrays [PDF]
Physical Review Research, 2023 In this work we evaluate whether the gravitational wave background recently observed by a number of different pulsar timing arrays could be due to merging supermassive black hole binaries. We find that for homogeneously distributed primordial black holes
Paul Frederik Depta +3 more
semanticscholar +1 more source
Supermassive primordial black holes from inflation [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 There is controversy surrounding the origin and evolution of our universe's largest supermassive black holes (SMBHs). In this study, we consider the possibility that some of these black holes formed from the direct collapse of primordial density ...
D. Hooper +3 more
semanticscholar +1 more source
The ASTRID simulation: the evolution of Supermassive Black Holes [PDF]
, 2021 We present the evolution of black holes (BHs) and their relationship with their host galaxies in Astrid, a large-volume cosmological hydrodynamical simulation with box size 250 $h^{-1} \rm Mpc$ containing $2\times5500^3$ particles evolved to z=3.
Y. Ni +8 more
semanticscholar +1 more source
Origin and growth of primordial black holes
Physics Letters B, 2021 Building on the insight that primordial black holes can arise from the formation and subsequent gravitational collapse of bound states of stable supermassive elementary particles during the early radiation era, we offer a comprehensive picture describing
Krzysztof A. Meissner, Hermann Nicolai
doaj +1 more source
The Role of AGN in Luminous Infrared Galaxies from the Multiwavelength Perspective
Universe, 2022 Galaxy mergers provide a mechanism for galaxies to effectively funnel gas and materials toward their nuclei and fuel the central starbursts and accretion of supermassive black holes.
Vivian U
doaj +1 more source
Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays [PDF]
Astrophysical Journal, 2020 The production and acceleration mechanisms of ultrahigh-energy cosmic rays (UHECRs) of energy >1020 eV, clearly beyond the GZK cutoff limit, remain unclear, which points to the exotic nature of the phenomena.
A. Tursunov +4 more
semanticscholar +1 more source
The ngEHT’s Role in Measuring Supermassive Black Hole Spins
Galaxies, 2022 While supermassive black-hole masses have been cataloged across cosmic time, only a few dozen of them have robust spin measurements. By extending and improving the existing Event Horizon Telescope (EHT) array, the next-generation Event Horizon Telescope (
Angelo Ricarte +4 more
doaj +1 more source
Seeding Supermassive Black Holes with Self-interacting Dark Matter: A Unified Scenario with Baryons [PDF]
Astrophysical Journal Letters, 2020 Observations show that supermassive black holes (SMBHs) with a mass of ∼109 M ⊙ exist when the universe is just 6% of its current age. We propose a scenario where a self-interacting dark matter halo experiences gravothermal instability and its central ...
Wei-Xiang Feng, Hai-Bo Yu, Yi-Ming Zhong
semanticscholar +1 more source