https://doi.org/10.1140/epjc/s10052-023-12337-6
Regular Article - Theoretical Physics
Circular geodesics in the field of double-charged dilatonic black holes
1
Department of Theoretical and Nuclear Physics, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, 050040, Almaty, Kazakhstan
2
National Nanotechnology Laboratory of Open Type, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, 050040, Almaty, Kazakhstan
3
Fesenkov Astrophysical Institute, Observatory 23, 050020, Almaty, Kazakhstan
4
Center for Gravitation and Fundamental Metrology, VNIIMS, Ozyornaya St. 46, 119361, Moscow, Russian Federation
5
Institute of Gravitation and Cosmology, Peoples’ Friendship University of Russia (RUDN University), Miklukho-Maklaya St. 6, 117198, Moscow, Russian Federation
Received:
24
August
2023
Accepted:
5
December
2023
Published online:
8
January
2024
A 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
, 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 
, the radii of the innermost stable circular orbit are presented and analyzed.
© The Author(s) 2024
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