Rotating non-Kerr black hole and energy extraction

Abstract

The properties of the ergosphere and energy extraction by Penrose process in a rotating non-Kerr black hole are investigated. It is shown that the ergosphere is sensitive to the deformation parameter $\epsilon$ and the shape of the ergosphere becomes thick with increase of the parameter $\epsilon$. It is of interest to note that, comparing with the Kerr black hole, the deformation parameter $\epsilon$ can enhance the maximum efficiency of the energy extraction process greatly. Especially, for the case of $a>M$, the non-Kerr metric describes a superspinning compact object and the maximum efficiency can exceed 60%, while it is only 20.7% for the extremal Kerr black hole.

16 pages, 5 figures, and 2 tables

References in corpus (21)

• The Confrontation between General Relativity and Experiment
• LISA Capture Sources: Approximate Waveforms, Signal-to-Noise Ratios, and Parameter Estimation Accuracy
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum: II. Black-Hole Images
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• Apparent shape of super-spinning black holes
• Slowly rotating black holes in alternative theories of gravity
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. III. Quasi-Periodic Variability
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum: I. Properties of a Quasi-Kerr Spacetime
• How to observe a non-Kerr spacetime
• Spinning Loop Black Holes
• Energy Extraction from Higher Dimensional Black Holes and Black Rings
• Direct imaging rapidly-rotating non-Kerr black holes
• A generalization of Ryan's theorem: probing tidal coupling with gravitational waves from nearly circular, nearly equatorial, extreme-mass-ratio inspirals
• Energy Extraction and Particle Acceleration Around Rotating Black Hole in Horava-Lifshitz Gravity
• Can we constrain the maximum value for the spin parameter of the super-massive objects in galactic nuclei without knowing their actual nature?
• Can an astrophysical black hole have a topologically non-trivial event horizon?
• Properties of a thin accretion disk around a rotating non-Kerr black hole
• Sgr A*: The Optimal Testbed of Strong-Field Gravity
• Spacetime Encodings I- A Spacetime Reconstruction Problem
• Testing the No-Hair Theorem with Sgr A*
• Energetics of a rotating charged black hole in 5-dimensional supergravity

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• Particle collisions in ergoregion of braneworld Kerr black hole
• Particle dynamics around a dyonic charged black hole
• Superradiance in Kerr-like black holes
• Circular Motion and Energy Extraction in a Rotating Black Hole
• Energy Extraction via Magnetic Reconnection in the Ergosphere of a rotating non-Kerr Black Hole
• Circular motion around a regular rotating Hayward black hole
• Strong gravitational lensing by a Konoplya-Zhidenko rotating non-Kerr compact object
• Higher dimensional non-Kerr black hole and energy extraction
• Radiation processes in the vicinity of non-Schwarzschild and non-Kerr black holes
• Energy extraction from a Konoplya-Zhidenko rotating non-Kerr black hole
• Properties of accretion flow in deformed Kerr spacetime
• Accretion flow in deformed Kerr spacetime: Spectral energy distributions from free-free emission
• Energy extraction and particle acceleration around a rotating dyonic black hole in $N=2$, $U(1{)}^2$ gauged supergravity