Efficiency of the Keplerian accretion in braneworld Kerr-Newman spacetimes and mining instability of some naked singularity spacetimes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F16%3AN0000015" target="_blank" >RIV/47813059:19240/16:N0000015 - isvavai.cz</a>

Výsledek na webu

<a href="http://journals.aps.org/prd/abstract/10.1103/PhysRevD.94.086006" target="_blank" >http://journals.aps.org/prd/abstract/10.1103/PhysRevD.94.086006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.94.086006" target="_blank" >10.1103/PhysRevD.94.086006</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Efficiency of the Keplerian accretion in braneworld Kerr-Newman spacetimes and mining instability of some naked singularity spacetimes

Popis výsledku v původním jazyce

We show that the braneworld rotating Kerr-Newman black hole and naked singularity spacetimes with both positive and negative braneworld tidal charge parameters can be separated into 14 classes according to the properties of circular geodesics governing the Keplerian accretion. We determine the efficiency of the Keplerian accretion disks for all braneworld Kerr-Newman spacetimes. We demonstrate the occurrence of an infinitely deep gravitational potential in Kerr-Newman naked singularity spacetimes having the braneworld dimensionless tidal charge $ b in (1/4, 1)$ and the dimensionless spin $a in (2 sqrt{b} - sqrt{b(4b - 1)}, 2 sqrt{b} + sqrt{b(4b - 1)}), implying unbound efficiency of the Keplerian accretion and the possibility of extracting the whole naked singularity mass. Therefore, we call them braneworld "mining-unstable" Kerr-Newman naked singularity spacetimes. Fundamental restriction on the relevance of the extraordinary-but fully classical-phenomenon of the mining instability is given by validity of the assumption of geodesic motion of the accreting matter.

Název v anglickém jazyce

Efficiency of the Keplerian accretion in braneworld Kerr-Newman spacetimes and mining instability of some naked singularity spacetimes

Popis výsledku anglicky

We show that the braneworld rotating Kerr-Newman black hole and naked singularity spacetimes with both positive and negative braneworld tidal charge parameters can be separated into 14 classes according to the properties of circular geodesics governing the Keplerian accretion. We determine the efficiency of the Keplerian accretion disks for all braneworld Kerr-Newman spacetimes. We demonstrate the occurrence of an infinitely deep gravitational potential in Kerr-Newman naked singularity spacetimes having the braneworld dimensionless tidal charge $ b in (1/4, 1)$ and the dimensionless spin $a in (2 sqrt{b} - sqrt{b(4b - 1)}, 2 sqrt{b} + sqrt{b(4b - 1)}), implying unbound efficiency of the Keplerian accretion and the possibility of extracting the whole naked singularity mass. Therefore, we call them braneworld "mining-unstable" Kerr-Newman naked singularity spacetimes. Fundamental restriction on the relevance of the extraordinary-but fully classical-phenomenon of the mining instability is given by validity of the assumption of geodesic motion of the accreting matter.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/GB14-37086G" target="_blank" >GB14-37086G: Centrum Alberta Einsteina pro gravitaci a astrofyziku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

—

Svazek periodika

94

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

28

Strana od-do

'086006-1'-'086006-28'

Kód UT WoS článku

000386173500003

EID výsledku v databázi Scopus

2-s2.0-84991717350