scholarly journals General Relativistic MHD Simulations of Jets from Accreting Black Holes

2007 ◽  
Author(s):  
Julian H Krolik ◽  
John Hawley
Keyword(s):  
Black Holes ◽  
Mhd Simulations ◽  
General Relativistic

scholarly journals Accretion disks around binary black holes of unequal mass: General relativistic MHD simulations of postdecoupling and merger

2014 ◽  
Vol 90 (10) ◽  
Author(s):  
Roman Gold ◽  
Vasileios Paschalidis ◽  
Milton Ruiz ◽  
Stuart L. Shapiro ◽  
Zachariah B. Etienne ◽  
...  
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Binary Black Holes ◽  
Unequal Mass ◽  
Mhd Simulations ◽  
General Relativistic

Beyond the Schwarzschild Metric

2018 ◽  
Author(s):  
David M. Wittman
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Gravitational Waves ◽  
Test Particle ◽  
Direct Detection ◽  
Relativistic Effects ◽  
Big Bang ◽  
Clusters Of Galaxies ◽  
General Relativistic ◽  
The Universe

General relativity explains much more than the spacetime around static spherical masses.We briefly assess general relativity in the larger context of physical theories, then explore various general relativistic effects that have no Newtonian analog. First, source massmotion gives rise to gravitomagnetic effects on test particles.These effects also depend on the velocity of the test particle, which has substantial implications for orbits around black holes to be further explored in Chapter 20. Second, any changes in the sourcemass ripple outward as gravitational waves, and we tell the century‐long story from the prediction of gravitational waves to their first direct detection in 2015. Third, the deflection of light by galaxies and clusters of galaxies allows us to map the amount and distribution of mass in the universe in astonishing detail. Finally, general relativity enables modeling the universe as a whole, and we explore the resulting Big Bang cosmology.

scholarly journals General-relativistic rotation: Self-gravitating fluid tori in motion around black holes

2018 ◽  
Vol 97 (10) ◽  
Author(s):  
Janusz Karkowski ◽  
Wojciech Kulczycki ◽  
Patryk Mach ◽  
Edward Malec ◽  
Andrzej Odrzywołek ◽  
...  
Keyword(s):  
Black Holes ◽  
General Relativistic

scholarly journals Plasmoid formation in global GRMHD simulations and AGN flares

2020 ◽  
Vol 495 (2) ◽  
pp. 1549-1565 ◽  
Author(s):  
Antonios Nathanail ◽  
Christian M Fromm ◽  
Oliver Porth ◽  
Hector Olivares ◽  
Ziri Younsi ◽  
...  
Keyword(s):  
Black Holes ◽  
Dipolar Field ◽  
Relativistic Jets ◽  
Poloidal Magnetic Field ◽  
Accretion Flows ◽  
Rotating Black Holes ◽  
General Relativistic ◽  
Formation And Evolution ◽  
Magnetohydrodynamic Simulations ◽  
Dissipation Processes

ABSTRACT One of the main dissipation processes acting on all scales in relativistic jets is thought to be governed by magnetic reconnection. Such dissipation processes have been studied in idealized environments, such as reconnection layers, which evolve in merging islands and lead to the production of ‘plasmoids’, ultimately resulting in efficient particle acceleration. In accretion flows on to black holes, reconnection layers can be developed and destroyed rapidly during the turbulent evolution of the flow. We present a series of two-dimensional general-relativistic magnetohydrodynamic simulations of tori accreting on to rotating black holes focusing our attention on the formation and evolution of current sheets. Initially, the tori are endowed with a poloidal magnetic field having a multiloop structure along the radial direction and with an alternating polarity. During reconnection processes, plasmoids and plasmoid chains are developed leading to a flaring activity and hence to a variable electromagnetic luminosity. We describe the methods developed to track automatically the plasmoids that are generated and ejected during the simulation, contrasting the behaviour of multiloop initial data with that encountered in typical simulations of accreting black holes having initial dipolar field composed of one loop only. Finally, we discuss the implications that our results have on the variability to be expected in accreting supermassive black holes.

scholarly journals Modelling the polarised emission from black holes on event horizon-scales

2020 ◽  
Vol 14 (S342) ◽  
pp. 9-12 ◽  
Author(s):  
Ziri Younsi ◽  
Oliver Porth ◽  
Yosuke Mizuno ◽  
Christian M. Fromm ◽  
Hector Olivares
Keyword(s):  
Black Holes ◽  
Radiative Transfer ◽  
Event Horizon ◽  
Theoretical Description ◽  
Accretion Flow ◽  
Fundamental Properties ◽  
Sagittarius A ◽  
General Relativistic ◽  
Realistic Images ◽  
Insight Into

AbstractUpcoming VLBI observations will resolve nearby supermassive black holes, most notably Sagittarius A* and M87, on event horizon-scales. Recent observations of Sagittarius A* with the Event Horizon Telescope have revealed horizon-scale structure. Accordingly, the detection and measurement of the back hole “shadow” is expected to enable the existence of astrophysical black holes to be verified directly. Although the theoretical description of the shadow is straightforward, its observational appearance is largely determined by the properties of the surrounding accretion flow, which is highly turbulent. We introduce a new polarised general-relativistic radiative transfer code, BHOSS, which accurately solves the equations of polarised radiative transfer in arbitrary strong-gravity environments, providing physically-realistic images of astrophysical black holes on event horizon-scales, as well as also providing insight into the fundamental properties and nature of the surrounding accretion flow environment.

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