KONOPLYA, Roman, Thomas PAPPAS and Olexandr ZHYDENKO. Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows. Physical Review D. 2020, vol. 101, No 4, p. "044054-1"-"044054-20", 20 pp. ISSN 2470-0010. Available from: https://dx.doi.org/10.1103/PhysRevD.101.044054.
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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
Original 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
WWW URL
RIV identification code RIV/47813059:19630/20:A0000034
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1103/PhysRevD.101.044054
UT WoS 000517256400005
Keywords in English Einstein-scalar-Gauss-Bonnet (EsGB) gravity;field equations
Tags FÚ, FÚ2020, GA19-03950S, RIV21
Tags International impact, Reviewed
Links GA19-03950S, research and development project.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 19/4/2021 14:28.
Abstract
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.
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