2020
Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
KONOPLYA, Roman; Thomas PAPPAS and Olexandr ZHYDENKOBasic information
Original name
Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
Authors
KONOPLYA, Roman (804 Ukraine, belonging to the institution); Thomas PAPPAS (300 Greece, belonging to the institution) and Olexandr ZHYDENKO (804 Ukraine, belonging to the institution)
Edition
Physical Review D, 2020, 2470-0010
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 5.296
RIV identification code
RIV/47813059:19630/20:A0000034
Organization unit
Institute of physics in Opava
UT WoS
000517256400005
Keywords in English
Einstein-scalar-Gauss-Bonnet (EsGB) gravity;field equations
Tags
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project.
Changed: 19/4/2021 14:28, Mgr. Pavlína Jalůvková
Abstract
In the original language
Recently, numerical solutions to the field equations of Einstein-scalar-Gauss-Bonnet (EsGB) gravity that correspond to black holes with nontrivial scalar hair have been reported. Here, we employ the method of the continued-faction expansion in terms of a compact coordinate in order to obtain an analytical approximation for the aforementioned solutions. For a wide variety of coupling functionals to the Gauss-Bonnet term we were able to obtain analytical expressions for the metric functions and the scalar field. In addition we estimated the accuracy of these approximations by calculating the black-hole shadows for such black holes. Excellent agreement between the numerical solutions and analytical approximations has been found.