Kinematic restrictions on particle collisions near extremal black holes: A unified picture
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Kinematic restrictions on particle collisions near extremal black holes: A unified picture
Original language description
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 "BSW effect" attracted much attention: it was generalized to arbitrary ("dirty") 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 "admissible region" 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 "mega-BSW" 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 "Wald charge" induced on rotating black holes in external magnetic fields.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/GB14-37086G" target="_blank" >GB14-37086G: Albert Einstein Center for Gravitation and Astrophysics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
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Volume of the periodical
95
Issue of the periodical within the volume
8
Country of publishing house
US - UNITED STATES
Number of pages
22
Pages from-to
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UT code for WoS article
000400255100008
EID of the result in the Scopus database
2-s2.0-85021647690