Precessing and periodic orbits around hairy black holes in Horndeski’s Theory

We investigate the dynamics of neutral timelike particles around a hairy black hole in Horndeski’s theory, which is characterized by a coupling parameter with the dimension of length. With deriving the particles’ relativistic periastron precessions, a preliminary bound on the hairy black hole is obt...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2023-04, Vol.83 (4), p.311-13, Article 311
Main Authors: Lin, Hou-Yu, Deng, Xue-Mei
Format: Article
Language:English
Subjects:
Analysis
Astronomy
Astrophysics and Cosmology
Black holes
Coupling
Elementary Particles
Gravitational fields
Gravity
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Neutral particles
Nuclear Energy
Nuclear Physics
Orbits
Parameters
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
Relativistic particles
String Theory
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Summary:We investigate the dynamics of neutral timelike particles around a hairy black hole in Horndeski’s theory, which is characterized by a coupling parameter with the dimension of length. With deriving the particles’ relativistic periastron precessions, a preliminary bound on the hairy black hole is obtained by using the result of the S2 star’s precession with GRAVITY. It is tighter than the previous result constrained by the shadow size from EHT observations of M87* by about 3–4 orders of magnitude. We also analyse the particles’ periodic motions around the hole in the strong gravitational field. It clearly shows that small variations in the coupling parameter can make the neutral particles’ motions back and forth from the quasi-periodic orbits to the periodic orbits or no bound orbit. Our present work might provide hints for distinguishing the hairy black hole in Horndeski’s theory from the classical hole by using the particles’ dynamics in the strong gravitational field.
ISSN:1434-6052
1434-6044
1434-6052
DOI:10.1140/epjc/s10052-023-11487-x