J
2020
Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
KONOPLYA, Roman, Thomas PAPPAS and Olexandr ZHYDENKO
Basic 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
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/47813059:19630/20:A0000034
Organization unit
Institute of physics in Opava
Keywords in English
Einstein-scalar-Gauss-Bonnet (EsGB) gravity;field equations
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project.
V originále
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.
Displayed: 23/12/2024 17:51