Circular geodesics in the field of double-charged dilatonic black holes

AbstractA non-extreme dilatonic charged (by two “color electric” charges) black hole solution is examined within a four-dimensional gravity model that incorporates two scalar (dilaton) fields and two Abelian vector fields. The scalar and vector fields interact through exponential terms containing two dilatonic coupling vectors. The solution is characterized by a dimensionless parameter a$$(0< a < 2)$$ ( 0 < a < 2 ) , which is a specific function of dilatonic coupling vectors. The paper presents solutions for timelike and null circular geodesics that may play a crucial role in different astrophysical scenarios, including quasinormal modes of various test fields in the eikonal approximation. For $$a = 1/2,1, 3/2,2 $$ a = 1 / 2 , 1 , 3 / 2 , 2 , the radii of the innermost stable circular orbit are presented and analyzed.

Authors
Boshkayev K. , Suliyeva G. , Ivashchuk V. , Urazalina A.
Publisher
Springer New York LLC
Number of issue
1
Language
English
Pages
19
Status
Published
Volume
84
Year
2024
Date of creation
01.07.2024
Date of change
01.07.2024
Short link
https://repository.rudn.ru/en/records/article/record/111703/
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