Results 21 to 30 of about 140,146 (178)
Photon Spheres, ISCOs, and OSCOs: Astrophysical Observables for Regular Black Holes with Asymptotically Minkowski Cores [PDF]
Universe, 2020 Classical black holes contain a singularity at their core. This has prompted various researchers to propose a multitude of modified spacetimes that mimic the physically observable characteristics of classical black holes as best as possible, but that ...
T. Berry, Alex Simpson, M. Visser
semanticscholar +1 more source
The Astrophysical Journal Letters, 2023 The recent Chandra-JWST discovery of a quasar in the z ≈ 10.1 galaxy UHZ1 reveals that accreting supermassive black holes were already in place 470 million years after the Big Bang. The Chandra X-ray source detected in UHZ1 is a Compton-thick quasar with
Priyamvada Natarajan +5 more
doaj +1 more source
Astrophysical hints for magnetic black holes [PDF]
Physical Review D, 2020 We discuss a cornucopia of potential astrophysical signatures and constraints on magnetically charged black holes of various masses. As recently highlighted, being potentially viable astrophysical candidates with immense electromagnetic fields, they may ...
D. Ghosh, A. Thalapillil, F. Ullah
semanticscholar +1 more source
Numerical simulations of the Cosmic Battery in accretion flows around astrophysical black holes [PDF]
, 2017 We implement the KORAL code to perform two sets of very long general relativistic radiation magnetohydrodynamic simulations of an axisymmetric optically thin magnetized flow around a non-rotating black hole: one with a new term in the electromagnetic ...
I. Contopoulos +4 more
semanticscholar +1 more source
Black holes surrounded by generic dark matter profiles: Appearance and gravitational-wave emission [PDF]
Physical Review D, 2023 We develop a numerical approach to find asymptotically flat black hole solutions coupled to anisotropic fluids, described by generic density profiles. Our model allows for a variety of applications in realistic astrophysical scenarios, and is potentially
E. Figueiredo, A. Maselli, V. Cardoso
semanticscholar +1 more source
Quasiperiodic oscillations around hairy black holes in Horndeski gravity [PDF]
The European Physical Journal C, 2023 Testing gravity theories and their parameters using observations is an important issue in relativistic astrophysics. In this context, we investigate the motion of test particles and their harmonic oscillations in the spacetime of non-rotating hairy black
J. Rayimbaev +3 more
semanticscholar +1 more source
Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes [PDF]
, 2016 The need for a consistent quantum evolution for black holes has led to proposals that their semiclassical description is modified not just near the singularity, but at horizon or larger scales.
S. Giddings, D. Psaltis
semanticscholar +1 more source
Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87* [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 In this study, we delve into the observational implications of rotating Loop Quantum Black Holes (LQBHs) within an astrophysical framework. We employ semi-analytical General Relativistic Radiative Transfer (GRRT) computations to study the emission from ...
Hong-Xuan Jiang +6 more
semanticscholar +1 more source
Possibility of hypothetical stable micro black hole production at future 100 TeV collider
European Physical Journal C: Particles and Fields, 2017 We study the phenomenology of TeV-scale black holes predicted in theories with large extra dimensions, under the further assumption that they are absolutely stable. Our goal is to present an exhaustive analysis of safety of the proposed 100 TeV collider,
A. V. Sokolov, M. S. Pshirkov
doaj +1 more source
European Physical Journal C: Particles and Fields, 2020 The possible existence of naked singularities, hypothetical astrophysical objects, characterized by a gravitational singularity without an event horizon is still an open problem in present day astrophysics.
Shahab Shahidi +2 more
doaj +1 more source