WFRF:(Gourgoulhon E.)
Sökning: WFRF:(Gourgoulhon E.) > Extracting black-ho...
- Lasota, J. P. (författare)
Extracting black-hole rotational energy: The generalized Penrose process
- Artikel/kapitelEngelska2014
Förlag, utgivningsår, omfång ...
- 2014
Nummerbeteckningar
- LIBRIS-ID:oai:gup.ub.gu.se/195725
- https://gup.ub.gu.se/publication/195725URI
- https://doi.org/10.1103/PhysRevD.89.024041DOI
Kompletterande språkuppgifter
- Språk:engelska
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- SwePubSwePub
Klassifikation
Anmärkningar
- In the case involving particles, the necessary and sufficient condition for the Penrose process to extract energy from a rotating black hole is absorption of particles with negative energies and angular momenta. No torque at the black-hole horizon occurs. In this article we consider the case of arbitrary fields or matter described by an unspecified, general energy-momentum tensor T-mu nu and show that the necessary and sufficient condition for extraction of a black hole's rotational energy is analogous to that in the mechanical Penrose process: absorption of negative energy and negative angular momentum. We also show that a necessary condition for the Penrose process to occur is for the Noether current (the conserved energy-momentum density vector) to be spacelike or past directed (timelike or null) on some part of the horizon. In the particle case, our general criterion for the occurrence of a Penrose process reproduces the standard result. In the case of relativistic jet-producing "magnetically arrested disks," we show that the negative energy and angular-momentum absorption condition is obeyed when the Blandford-Znajek mechanism is at work, and hence the high energy extraction efficiency up to similar to 300% found in recent numerical simulations of such accretion flows results from tapping the black hole's rotational energy through the Penrose process. We show how black-hole rotational energy extraction works in this case by describing the Penrose process in terms of the Noether current.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
- 3-DIMENSIONAL MAGNETOHYDRODYNAMIC SIMULATIONS
- BLANDFORD-ZNAJEK
- MECHANISM
- ACTIVE GALACTIC NUCLEI
- ELECTROMAGNETIC EXTRACTION
- ACCRETION
- FLOWS
- ENERGETICS
- HORIZONS
- PLASMA
- FIELD
- JETS
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Gourgoulhon, E. (författare)
- Abramowicz, Marek A,1945Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xabrma (författare)
- Tchekhovskoy, A. (författare)
- Narayan, R. (författare)
- Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Physical Review D89:21550-7998
Internetlänk
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- Lasota, J. P.
- Gourgoulhon, E.
- Abramowicz, Mare ...
- Tchekhovskoy, A.
- Narayan, R.
- Om ämnet
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- NATURVETENSKAP
- NATURVETENSKAP
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