Dragging of inertial frames by matter and waves

2021 ◽  
Author(s):  
Jiří Bičák ◽  
Tomáš Ledvinka
Keyword(s):  
Black Holes ◽  
Perturbation Theory ◽  
Inertial Frame ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory ◽  
Frame Dragging ◽  
Inertial Frames ◽  
Rotating Black Holes ◽  
Quantum Detection ◽  
General Relativistic

In this paper, we review and analyze four specific general-relativistic problems in which gravitomagnetism plays an important role: the dragging of magnetic fields around rotating black holes, dragging inside a collapsing slowly rotating spherical shell of dust, compared with the dragging by rotating gravitational waves. We demonstrate how the quantum detection of inertial frame dragging can be accomplished by using the Unruh–DeWitt detectors. Finally, we shall briefly show how “instantaneous Machian gauges” can be useful in the cosmological perturbation theory.

Spinning black holes

2019 ◽  
pp. 418-442
Author(s):  
Nils Andersson
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Perturbation Theory ◽  
Kerr Solution ◽  
Frame Dragging ◽  
Rotating Black Holes

This chapter discusses the physics of rotating black holes, introducing new features like rotational frame dragging. The Kerr solution is discussed, as is the Newman–Penrose approach and the black-hole perturbation theory.

Delta N Formalism in Cosmological Perturbation Theory

10.1142/10953 ◽  
2018 ◽  
Author(s):  
Ali Akbar Abolhasani ◽  
Hassan Firouzjahi ◽  
Atsushi Naruko ◽  
Misao Sasaki
Keyword(s):  
Perturbation Theory ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory

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.

COSMOLOGICAL PERTURBATIONS IN GENERALIZED GRAVITY THEORIES

2004 ◽  
Vol 19 (13n16) ◽  
pp. 1203-1206 ◽  
Author(s):  
HYERIM NOH ◽  
JAI-CHAN HWANG
Keyword(s):  
Perturbation Theory ◽  
Cosmological Perturbations ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory ◽  
String Correction ◽  
Gravity Theories ◽  
Correction Terms ◽  
Classical Evolution

We present cosmological perturbation theory based on generalized gravity theories including string correction terms as well as a tachyonic complication. The classical evolution as well as the quantum generation processes in these variety of gravity theories are presented in unified forms. These apply both to the scalar- and tensor-type perturbations.

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