Kinematic restrictions on particle collisions near extremal black holes: A unified picture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10371671" target="_blank" >RIV/00216208:11320/17:10371671 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevD.95.084055" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.95.084055</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.95.084055" target="_blank" >10.1103/PhysRevD.95.084055</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Kinematic restrictions on particle collisions near extremal black holes: A unified picture

Popis výsledku v původním jazyce

In 2009, Banados, Silk, and West (BSW) pointed out the possibility of having an unbounded limit of center-of-mass collision energy for test particles in the field of an extremal Kerr black hole, if one of them has fine-tuned parameters and the collision point is approaching the horizon. The possibility of this &quot;BSW effect&quot; attracted much attention: it was generalized to arbitrary (&quot;dirty&quot;) rotating black holes and an analogy was found for collisions of charged particles in the field of nonrotating charged black holes. Our work considers the unification of these two mechanisms, which have so far been studied only separately. Exploring the enlarged parameter space, we find kinematic restrictions that may prevent the fine-tuned particles from reaching the limiting collision point. These restrictions are first presented in a general form, which can be used with an arbitrary black-hole model, and then visualized for the Kerr-Newman solution by plotting the &quot;admissible region&quot; in the parameter space of critical particles, reproducing some known results and obtaining a number of new ones. For example, we find that (marginally) bounded critical particles with enormous values of angular momentum can, curiously enough, approach the degenerate horizon, if the charge of the black hole is very small. Such &quot;mega-BSW&quot; behavior is excluded in the case of a vacuum black hole, or a black hole with large charge. It may be interesting in connection with the small &quot;Wald charge&quot; induced on rotating black holes in external magnetic fields.

Název v anglickém jazyce

Kinematic restrictions on particle collisions near extremal black holes: A unified picture

Popis výsledku anglicky

In 2009, Banados, Silk, and West (BSW) pointed out the possibility of having an unbounded limit of center-of-mass collision energy for test particles in the field of an extremal Kerr black hole, if one of them has fine-tuned parameters and the collision point is approaching the horizon. The possibility of this &quot;BSW effect&quot; attracted much attention: it was generalized to arbitrary (&quot;dirty&quot;) rotating black holes and an analogy was found for collisions of charged particles in the field of nonrotating charged black holes. Our work considers the unification of these two mechanisms, which have so far been studied only separately. Exploring the enlarged parameter space, we find kinematic restrictions that may prevent the fine-tuned particles from reaching the limiting collision point. These restrictions are first presented in a general form, which can be used with an arbitrary black-hole model, and then visualized for the Kerr-Newman solution by plotting the &quot;admissible region&quot; in the parameter space of critical particles, reproducing some known results and obtaining a number of new ones. For example, we find that (marginally) bounded critical particles with enormous values of angular momentum can, curiously enough, approach the degenerate horizon, if the charge of the black hole is very small. Such &quot;mega-BSW&quot; behavior is excluded in the case of a vacuum black hole, or a black hole with large charge. It may be interesting in connection with the small &quot;Wald charge&quot; induced on rotating black holes in external magnetic fields.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

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

2017

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

95

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

22

Strana od-do

—

Kód UT WoS článku

000400255100008

EID výsledku v databázi Scopus

2-s2.0-85021647690